Question

3. A coil of 100 turns encloses an area of 100 cm2. It is placed at an angle of 700 with a

magnetic field of 0.1 Wbm-2. What is the magnetic flux through the coil? If the magnetic
field is reduced to zero in 10-3s, what emf is induced in the coil?​

Answer 1

Step-by-step explanation:

Given that,

Number of turns in the coil, N = 100

Area of the coil, A = 100 cm² = 0.01 m²

It is placed at an angle of 70°.

Magnetic field, B = 0.1 Wb/m²

We need to find the magnetic flux through the coil and the emf is induced in the coil after 10⁻³ s.

Magnetic flux is given by :

`\phi =BA\cos\theta\\\\\text{For N turns},\\\phi =NBA\cos\theta \\\\\phi=100* 0.1* 0.01* \cos(70)\\\\=0.034\ Wb`

So, the magnetic flux through the coil is 0.1 Wb.

Emf induced in the coil is :

`\epsilon=(-d\phi)/(dt)\\\\=(0.034)/(10^(-3))\\\\=34\ V`

So, 34V of emf is induced in the coil.