# Finding the Direction of Induced emf Using Conservation of Energy

• 1.

Determine the direction of induced emf in a coil placed in an increasing magnetic field if the magnetic field is directed out of the page and passes through the coil.

• The direction of induced emf in the coil will be in an anti-clockwise direction.

• The direction of induced emf in the coil will be in a clockwise direction.

• The direction of induced emf cannot be determined.

• No emf will be induced in the coil as the field is increasing.

• 2.

A coil moves toward an increasing magnetic field that is directed upward, calculate, in which direction emf will be induced in the coil.

• The direction of induced emf cannot be determined.

• Emf will be induced in a counter-clockwise direction.

• No emf will be induced in the coil.

• Emf will be induced in a clockwise direction.

• 3.

What will be the direction of induced emf if an increasing magnetic field is directed into the plane and passes over a coil?

• A counter-clockwise emf will be induced in the coil.

• A clockwise emf will be induced in the coil.

• Both clockwise and counter-clockwise emf will be induced.

• The direction of induced emf cannot be determined.

• 4.

A magnetic field increases from {eq}8\ \rm mT {/eq} to {eq}10\ \rm mT {/eq} out of the plane. If this magnetic field is projected on a coil then find the direction of the emf induced in the coil.

• The coil will have a counter-clockwise induced emf.

• The coil will have both clockwise and counter-clockwise induced emf.

• The coil will have a clockwise induced emf.

• The direction cannot be determined.

• 5.

The north pole of a magnet having a decreasing magnetic field is directed into the page passing through a horizontally placed coil. What will be the direction of the emf induced in the coil due to this motion?

• An anti-clockwise induced emf will be produced in the coil.

• No emf will be produced.

• A clockwise induced emf will be produced in the coil.

• The direction of the induced emf cannot be determined.

• 6.

A decreasing magnetic field is directed into the page that passes over a conducting loop. Determine the direction of emf induced in the conducting loop.

• The direction of emf induced in the conducting loop will be in a clockwise direction.

• Both clockwise and anticlockwise emf will be induced in the conduction loop.

• No emf will be induced in the conducting loop.

• The direction of emf induced in the conducting loop will be in an anti-clockwise direction.

• 7.

A magnetic field decrease from {eq}10\ \rm \mu T {/eq} to {eq}6\ \rm \mu T {/eq} towards the plane and passes over a coil. The emf induced in the coil will be equal to which of the following?

• First, a counter-clockwise emf will be induced, and then a clockwise emf.

• No emf will be induced in the coil.

• A counter-clockwise emf will be induced.

• A clockwise emf will be induced.

• 8.

A coil is placed horizontally on a plane. An increasing magnetic field is directed towards the coil in such a way that it appears to be coming out of the plane. Can you predict the direction of the emf induced in the coil?

• A clockwise emf will be induced in the coil.

• A counter-clockwise emf will be induced in the coil.

• A decreasing emf will be induced in the coil.

• No emf will be induced in the coil.

• 9.

Calculate the direction of emf induced in a coil placed in an increasing magnetic field. If the magnetic field is directed into the page and the coil lies horizontally on the plane.

• Emf will be induced in both clockwise and counter-clockwise directions.

• A counter-clockwise emf will be induced in the coil.

• No emf will be induced in the coil.

• A clockwise emf will be induced in the coil.

• 10.

What will be the direction of the emf induced in a coil placed vertically in a decreasing magnetic field if the magnetic field is directed out of the page?

• The direction of induced emf cannot be determined.

• The direction of induced emf in the coil will be in a counter-clockwise direction.

• The direction of induced emf in the coil will have both clockwise and counter-clockwise directions.

• The direction of induced emf in the coil will be in a clockwise direction.

• 11.

A student moves the north pole of a magnet that has an increasing magnetic field toward a hanging coil. If there is a change in the magnetic field due to the movement of the magnet toward the coil, determine in which direction an emf will be induced in the coil.

• Only a clockwise emf will be induced.

• Both clockwise and counter-clockwise emf will be induced.

• No emf will be induced.

• Only a counter-clockwise emf will be induced.

• 12.

In what direction will an emf be induced in a coil placed in an increasing magnetic field and directed out of the page?

• Both clockwise and counter-clockwise emf will get induced.

• A clockwise emf will be induced.

• No emf will get induced.

• A counter-clockwise emf will be induced.

• 13.

In a physics demonstration, a teacher asked a student to determine the direction of induced emf in a coil placed in a changing magnetic field. If the magnetic field increases from {eq}5.5\ \rm \mu T {/eq} to {eq}8.2\ \rm \mu T {/eq} towards the south, then which of the given statements will correctly state the student's answer?

• The coil will have a counter-clockwise induced emf.

• The coil will have a clockwise induced emf.

• The coil will have both clockwise and counter-clockwise induced emf.

• The direction of induced emf cannot be predicted.

• 14.

If a conducting coil is placed in a decreasing magnetic field and directed into the plane, predict the direction of the emf induced in the coil.

• Both clockwise and counter-clockwise emf are induced in the coil.

• A clockwise emf is induced in the coil.

• A counter-clockwise emf is induced in the coil.

• No emf is induced in the coil.

• 15.

A magnetic field is projected over a coil placed on a stand to observe the direction of induced emf. If the magnetic field decreases from {eq}9\ \rm mT {/eq} to {eq}4\ \rm mT {/eq} and the field lines move into the plane then calculate the direction of the induced emf in the coil.

• No emf is induced in the coil.

• Clockwise emf is induced in the coil.

• Counter-clockwise emf is induced in the coil.

• EMf is induced in the coil but the direction cannot be predicted.

• 16.

A magnet with a decreasing magnetic field moves toward a coil at a certain speed. If the south pole of the magnet is oriented toward the coil, in which direction will an emf be induced in the coil?

• In a clockwise direction.

• Cannot be determined.

• Emf will not get induced in the coil.

• In a counter-clockwise direction.

• 17.

If the north pole of a magnet with a decreasing magnetic field moves away from a coil upward, determine which of the following statements correctly relates to the direction of the induced emf in the coil.

• Emf will get induced, but only in a counter-clockwise direction.

• Emf will get induced in both clockwise as well as counter-clockwise directions.

• Emf will not get induced in the coil.

• Emf will get induced, but only in a clockwise direction.

• 18.

A decreasing magnetic field moves toward a coil placed outward from the page, determine which of the following statements correctly refers to the direction of the induced emf in the coil.

• Emf will never get induced in the coil.

• Emf will get induced in the coil but we cannot predict the direction.

• Only clockwise emf will get induced in the coil.

• Only counter-clockwise emf will get induced in the coil.

• 19.

A decreasing magnetic field directed inward in the plane passes over a coil. Predict the direction in which emf will be induced in the coil.

• Only clockwise emf will get induced in the coil.

• Only counter-clockwise emf will get induced in the coil.

• As the magnet is stationary, emf will not get induced in the coil.

• The induced emf's direction cannot be predicted.

• 20.

Daisy places a circular conductor in an increasing magnetic field. If the field is directed into the plane then which of the given statements is correct regarding Daisy's observation of induced emf.

• No emf will get induced in the circular conductor as the field is increasing.

• A clockwise emf will get induced in the circular conductor.

• Both clockwise and counter-clockwise emf will get induced in the circular conductor.

• A counter-clockwise emf will get induced in the circular conductor.

• 21.

Find the direction of induced emf in a coil placed in a decreasing magnetic field. If the magnetic field is directed out of the page and passes through the coil lying horizontally.

• The coil will have an anti-clockwise induced emf.

• The direction of induced emf cannot be predicted.

• The coil will have a clockwise induced emf.

• The coil won't have any induced emf.

• 22.

If a coil is moved toward the south pole of a magnet with an increasing magnetic field, in which direction will emf be induced in the coil?

• Predicting the direction of induced emf is not possible.

• Anti-clockwise emf will be induced in the coil.

• No emf will be induced in the coil.

• Clockwise emf will be induced in the coil.

• 23.

Predict the direction of induced emf, if an increasing magnetic field is directed into the plane and passes over a coil?

• Both clockwise and counter-clockwise emf will be induced in the coil.

• A counter-clockwise induced emf will be generated in the coil.

• The direction of induced emf cannot be predicted.

• A clockwise induced emf will be generated in the coil.

• 24.

A changing magnetic field increases from {eq}2\ \rm mT {/eq} to {eq}5\ \rm mT {/eq} into the page. Determine the direction of induced emf if this magnetic field is projected on a coil placed vertically.

• The coil will have no induced emf.

• Predicting the direction of induced emf is not possible.

• A clockwise emf will be induced in the coil,

• A counter-clockwise emf will be induced in the coil.

• 25.

The north pole of a magnet with an increasing magnetic field moves toward a horizontally placed coil. Predict the direction of the induced emf produced in the coil due to this motion.

• Clockwise emf will be induced in the coil.

• There will be no induced emf in the coil.

• Predicting the direction of induced emf is not possible.

• Counter-clockwise emf will be induced in the coil.

• 26.

An increasing magnetic field is projected out of the page that passes over a conducting loop. Determine the direction of emf induced in the conducting loop.

• Both clockwise and counter-clockwise emf will get induced in the conducting loop.

• A counter-clockwise emf will get induced in the conducting loop.

• A clockwise emf will get induced in the conducting loop.

• No emf will be induced in the conducting loop.

• 27.

A magnetic field increases from {eq}3\ \rm \mu T {/eq} to {eq}6\ \rm \mu T {/eq} upward and passes over a conductor in the form of a coil. The direction of emf induced in the coil will be equal to which of the following?

• The direction of emf induced in the coil will be in a counter-clockwise direction.

• The direction of emf cannot be determined.

• The direction of emf induced in the coil will be in a clockwise direction.

• No emf will be induced in the coil.

• 28.

A coil is placed horizontally on a table and a magnetic field is directed towards the coil in such a way that it appears to be coming out of the plane. Can you predict the direction of the emf induced in the coil if the magnetic field is a decreasing one?

• Both clockwise and counter-clockwise induced emf.

• A clockwise induced emf.

• Cannot predict the direction of induced emf.

• A counter-clockwise induced emf.

• 29.

Determine the direction of emf induced in a coil placed in a decreasing magnetic field. If the magnetic field is directed into the page and the coil lies horizontally on the plane.

• The direction of induced emf cannot be predicted.

• Emf will be induced in both clockwise and counter-clockwise directions.

• Emf will be induced in a clockwise direction.

• Emf will be induced in a counter-clockwise direction.

• 30.

What will be the direction of the induced emf in a coil placed vertically in the north direction, if an increasing magnetic field moves toward the coil?