The rectangular coils in a 345-turn generator are 12 cm by 12 cm. part a
what is the maximum emf produced by this generator when it rotates with an angular speed of 505 rpm in a magnetic field of 0.45 t ? express your answer using two significant figures.

118.166 volt

Explanation:

We have given number of turns N =345

Sides of the rectangular coils is 12 cm =0.12 m

So area A =0.12×0.12=0.0144

Magnetic field B =0.45 T

Angular speed =505 rpm

Speed in rad/sec

The emf is given by

For maximum emf sinwt =1

So

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it