You're an electrical engineer designing an alternator (the generator that charges a car's battery). mechanical engineers specify a 10-cm-diameter rotating coil, and you determine that you can fit 250 turns in this coil. to charge a 12-vbattery, you need a peak output of 15v when the alternator is rotating at 1000 rpm. what do you specify for the alternator's magnetic field?

B=0.07299 T( required magnitude of Magnetic field)

Explanation:

Given:

diameter of coil= 10 cm implies radius=5 cm

emf induced= 14V

rmp N= 1000

therefore,

put values

=104.71 rad/sec

The area of coil is given by

A=

A=

=

The expression of peak Emf induced in the rotating  coil is

is given by

rearranging the expression to find B

on calculating we get

B=0.07299 T( required magnitude of Magnetic field)

e) none of the above answers are correct