- #1

member 217843

## Homework Statement

A rectangular coil of 90 turns has dimensions of 22 x 65 cm and is located in a uniform 1 T magnetic field. In 1.7 s, the plane of the coil is rotated from a position where it makes an angle of 19° with the magnetic field to a position where it makes an angle of 64°. Calculate the average emf induced in the coil.

## Homework Equations

emf= -N*(d[itex]\Phi[/itex]/dt)

[itex]\Phi[/itex]=BAcos[itex]\vartheta[/itex]

## The Attempt at a Solution

So I calculated the change in flux to be: (B*A*cos(90-64))-(B*A*cos(90-19)=B*A*(cos(26)-cos(71))

I then calculated emf.

emf= - ((90 turns)*(1 T)*(0.22m*0.65m)*(cos(26)-cos(71)))/1.7 s = -4.34 V

This is wrong. I then entered the absolute value, which is also incorrect.