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CBSE 10th Standard Science Subject Magnetic Effects of Electric Current Ncert Exemplar 2 Mark Questions 2021

Published on: 26/05/2021

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Std: 10th Standard CBSE - Science

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Questions:

Generic 2

5 x 2 = 10

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

When does an electric short circuit occur?

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.

Name some devices in which electric motors are used .

List three methods of producing magnetic field.

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Answers Key:

Generic 2

5 x 2 = 10

The earth wire is connected to a metallic plate buried deep inside the earth. In this way, the metallic body of appliance is connected to the earth, which provides a low resistance conducting path for electric current. Hence, any leakage of current to the metallic body of appliance flows to the earth through the earth wire. The user might not get a severe electric shock on touching such an appliance in case of a fault.

An electric short circuit occurs when the insulation of wires is damaged or there is a fault in the appliance. Due to this, the live wire and neutral wire come in direct contact and the current in the circuit increases abruptly.

When two circular coils A and B placed close to each other and the current in coil A is changed, it leads to induction of current in coil B. This happens because of change in magnetic field of coil A, because of change in current in this coil.

Electric fan, mixer grinder, tape recorder, CD player, hard disk drive, washing machine, cooler, toy car, vacuum cleaner, etc.

(a) By permanent magnet
(b) By electromagnet
(c) By current carrying conductors