# A 14.5 cm diameter wire coil is initially oriented so that its plane is perpendicular to a...

## Question:

A 14.5 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.51 T pointing up. During the course of 0.20 s, the field is changed to one of 0.25 T pointing down.

What is the average induced emf in the coil?

## Faraday's Law of Electromagnetic Induction:

Faraday's Law of Electromagnetic Induction states that induced emf is directly proportional the rate of change of magnetic flux linked with the coil. Mathematically

{eq}\begin{align} \epsilon =- N\frac{ \Delta \Phi }{\Delta t} \end{align} {/eq}

## Answer and Explanation:

Let us recap important information from the question

- Radius of the coil {eq}r =\frac{ D}{2} =\frac{ 14.5 \ cm }{2} = 7.25 \ cm = 0.0725 \...

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from High School Physics: Help and Review

Chapter 13 / Lesson 10