Question

A small flat search coil of area 5cm2 with 140 closely wound turns is placed between poles of powerful magnet producing

Answer 1

As it is not stated clearly,

The general relation between area, number of turns

Magenetic field is proportional to number of turns in the coil.

While the magnetic flux is proportional to the magnetic field as well as area

Answer 2

Answer:

The magnetic flux through the coil is $0.45\times10^{-4}\ Wb$.

Explanation:

Suppose that, a small flat search coil of area 5 cm² with 140 closely wound turns is placed between poles of powerful magnet producing magnetic field 0.09 T and then quickly removed out of the field region.

So, we find the change the magnetic flux through the coil

We use the formula of magnetic flux

$\phi = BA\cos\theta$

Where, B = magnetic field

A = area

θ = 0°

Put the value into the formula

$\phi=0.09\times5\times10^{-4}\cos0$

$\phi=0.000045\ Wb$

$\phi=0.45\times10^{-4}\ Wb$

Hence, The magnetic flux through the coil is $0.45\times10^{-4}\ Wb$.