Aclosely wound rectangular coil of 80 turns has dimensions of 25.0 cm by 40.0 cm. the plane of the coil is rotated from a position where it makes an angle of 37.0 ∘ with a magnetic field of 1.30 t to a position perpendicular to the field. the rotation takes 0.0900 s . what is the average emf emf induced in the coil? what is the magnitude of the average emf e induced as the coil is rotated? e= v

Explanation:

Given:

no. of turns in the coil,

magnetic field, B = 1.3 T

area of the coil,

initial angle of the coil plane from the magnetic field,

final angle of the coil plane from the magnetic field,

time taken to rotate through the angle,

Now  we find initial and final flux through the coil:

&

Now we know according to Faraday's Law, emf induced in a coil is given by:

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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