Question 147: Electromagnetic Induction

Question

When the current changes from $$ + 2A$$ to $$-2A$$ in $$0.05$$ second, an $$e.m.f.$$ of $$8$$ $$V$$ is inducted in a coil. The coefficient of self- induction of the coil is

Accepted Answer

$$e =  - {{\Delta \phi } \over {\Delta t}} = {{ - \Delta \left( {LI} ight)} \over {\Delta t}} =  - L{{\Delta I} \over {\Delta t}}$$
$$	herefore$$ $$\left| e ight| = L{{\Delta I} \over {\Delta t}} \Rightarrow 8 = L 	imes {4 \over {0.05}}$$
$$ \Rightarrow L = {{8 	imes 0.05} \over 4} = 0.1H$$

Answer

$$0.2H$$

Answer

$$0.4H$$

Answer

$$0.8$$ $$H$$

Answer

$$0.1$$ $$H$$

Electromagnetic Induction

When the current changes from $ + 2A to -2A in 0.05 second, an e.m.f. of 8 V$ is inducted in a coil. The coefficient of self- induction of the coil is

Choose the correct answer: