If in a coil rate of change of area is 5 m e t r e 2 m i l l i s e c o n d and current become 1 amp form 2 amp in 2 × 10 − 3 sec. If magnetic field is 1 Tesla then self inductance of the coil is Options: A . &nbsp2 H B . &nbsp5 H C . &nbsp20 H D . &nbsp10 H

Answer: Option D : D e = B . d A d t = L d i d t ⇒ 1 × 5 10 − 3 = L × ( 2 − 1 ) 2 × 10 − 3 ⇒ L = 10 H

If in a coil rate of change of area is 5metre2millisecond and current

Question

If in a coil rate of change of area is

\frac{5 m e t r e^{2}}{m i l l i s e c o n d}

and current become 1 amp form 2 amp in

2 \times 10^{- 3}

sec. If magnetic field is 1 Tesla then self inductance of the coil is

Options:

A . 2 H

B . 5 H

C . 20 H

D . 10 H

Answer: Option D
:
D

e = B . \frac{d A}{d t} = L \frac{d i}{d t} \Rightarrow 1 \times \frac{5}{10^{- 3}} = L \times \frac{(2 - 1)}{2 \times 10^{- 3}} \Rightarrow L = 10 H

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