Q17 of 39 Page 240

When does an electric short circuit occur?

An electric short circuit takes place when the live wire and the neutral wire of electricity supply line touch each other directly. This occurs when the plastic insulation of live wire and neutral wire get torn.


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14

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

 15

State the rule to determine the direction of a:

(i) magnetic field produced around a straight conductor carrying current.


(ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.


(iii) current induced in a straight conductor moving in a magnetic field.

 16

Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?

 18

Why is it necessary to earth metallic appliances? What is the function of an earth wire?