Q10 of 72 Page 13

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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8

When is the force experienced by a current-carrying conductor placed in a magnetic field largest ?

 9

Core of an electromagnet must be of soft iron but not steel. Justify it.

 11

What is solenoid? What does the divergence of magnetic field lines near the ends of a current-carrying straight solenoid indicate?

 12

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.