Question
Two magnets are placed near a current-carrying coil.
The diagram shows this experimental arrangement and the current direction in the coil.
Which statement is correct?
- Both X and Y are attracted to the coil.
- Both X and Y are repelled by the coil.
- X is attracted to the coil and Y is repelled.
- X is repelled by the coil and Y is attracted.
Answer/Explanation
Ans:
B
Question
Two magnets are placed near a current-carrying coil.
The diagram shows this experimental arrangement and the current direction in the coil.
Which statement is correct?
- Both X and Y are attracted to the coil.
- Both X and Y are repelled by the coil.
- X is attracted to the coil and Y is repelled.
- X is repelled by the coil and Y is attracted.
Answer/Explanation
Ans:
B
Question
A student investigates the output voltage induced across a coil of wire by a bar magnet.
When will the induced voltage have the greatest value?
A The student slowly moves the bar magnet into the coil of wire.
B The student leaves the bar magnet stationary in the coil of wire.
C The student quickly removes the bar magnet from the coil of wire.
D The student places the bar magnet at rest outside the coil of wire.
Answer/Explanation
Ans:C
Question
Two circuits are set up as shown. The iron rods are placed close together and are able to move.
What happens to the size of the gap at X when switch S is closed?
- It decreases.
- It decreases then increases.
- It increases.
- It does not change.
Answer/Explanation
Ans:
C
Question
The diagram shows an electromagnet near a coil of wire connected to a voltmeter.
The reading on the voltmeter is zero.
The switch is closed. The electromagnet magnetises quickly.
What happens to the reading on the voltmeter?
A It keeps increasing.
B It quickly increases and stays at maximum.
C It quickly increases and then decreases.
D It stays on zero.
Answer/Explanation
Ans: C