3
Explain the factors on which heating effect of electric current depends.
Draw a basic circuit diagram by using-a cell, a bulb, connecting wires and a
switch.
4. What is an electromagnet and how is it made? Name the factors which help in
Answers
Answer:
Ans3
The heating effect of an electric current depends on three factors: The resistance, R of the conductor. A higher resistance produces more heat. The time, t for which current flows.
Ans4
Electromagnet is a soft iron core which when placed inside a solenoid, behaves like a powerful magnet whenever a current is passed through the solenoid. The iron core loses it's magnetism when the current is switched off,and it behaves no longer as an electromagnet. Thus, electromagnets are temporary magnets.
Factors on which the strength of an electromagnet depends:
(i) Number of turns in the coil: The larger the number of turns in the coil, greater is the strength of the electromagnet.
(ii) Strength of the current: The larger the current passed through the solenoid, more powerful is the electromagnet.
(iii) Nature of the core material: The core of the magnetic material like soft iron increases the strength of the electromagnet.
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