Question

A coil of wire with area 0.18 m^2 and 45 turns is placed with its plane parallel to a magnetic field with B = 3.1 T. The coil is then turned so that its plane is now at an angle of 28 degrees to the magnetic field, in a time of 23 ms. What is the induced emf in the coil, in units of volts?

Answer 1

Answer:

Initially flux, ϕ=BAcos0=BA

After rotating through an angle 90

o

.

Flux through the coil is zero.

So, Δϕ=BA

Angular speed =w, so, time period =

ω

2π

=T

4

T

is time taken to rotate 90

o

.

So,

Δt

Δϕ

=

T/4

BA

=

π

2BAω

Answer 2

Answer:

2222222222333333

Explanation:

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