# Electromagnetic induction

1. May 23, 2016

### Neha98

When does the rate of change of magnetic flux in linkage with a coil rotating in a uniform magnetic field equal zero?

2. May 23, 2016

### BvU

Hello Neha,

PF rules want you to show a bit more: equations, and an attempt at solution. To get started:

In general you have something like $\Phi = A B N \cos(\theta) =A B N \cos(\omega t)$ with $\Phi$ the flux, A area, B magnetic field, N number of turns and the angle $\theta$ between the perpendicular to the area and the magnetic field $\vec B$ varies with time as $\omega t$. $\omega$ is the angular speed.

The rate of change is ${d\Phi\over dt}$ and I expect you can do the differentiation and find when it gives zero ?