Physics
Grade-10
Easy
Question
Read the following statements and choose the correct option:
Assertion: The strength of an electromagnet depends on the number of turns in the solenoid.
Reason: Electromagnet is a temporary magnet.
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true
Hint:
Both A and R are true, but R is not the correct explanation of A
The correct answer is: Both A and R are true, but R is not the correct explanation of A.
The strength of magnetic field of an electromagnet depends on: The number of turns of wire wound around the coil, and the amount of current flowing through the wire. Electromagnet is a temporary magnet. An electromagnet has a magnetic field created by electric current. Electricity and magnetism are closely related to each other. Wherever there is electricity there is magnetic field, when the current is turned off the magnetic field disappears. Hence, it is temporary.
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Reason: Electromagnet is a permanent magnet.
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Reason: Electromagnet is a permanent magnet.
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Match the following with the correct response.
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(2) Compass needle (B) Temporary magnet
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Read the following statements and choose the correct option:
Statement A: The magnetic field produced by a current-carrying loop has no poles.
Statement B: Like poles of magnets repel each other.
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Statement B: Like poles of magnets repel each other.
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