MOCK TEST - 1

State Fleming's left hand rule. Explain with the help of labelled diagram.

Two circular coils $A$ and $B$ are placed close to each other. If the current in coil $A$ is changed, will some current be induced in the coil $B$? Give the reason for your answer.

Distinguish between the terms overloading and short-circuiting as used in domestic circuits.

Why are fuses fitted in the fuse box of domestic electricity supply?

Which device can be used in place of fuses?

What are magnetic field lines? List any two characteristics of field lines. Draw the pattern of magnetic field lines due to a current-carrying circular loop.

Define electromagnetic induction.

Two coils $\mathrm{P}$ and $\mathrm{S}$ are wound over the same iron core. Coil $\mathrm{P}$ is connected to battery and key and the coil $\mathrm{S}$ is connected to galvanometer. Write your observation when:

(i) Current in the coil $\mathrm{P}$ is started by closing the key.

(ii) Current continues to flow in the coil $\mathrm{P}$.

(iii) Current in coil $\mathrm{P}$ is stopped by removing the key.

Explain the reason for each observation.