A) torroid carrying current
B) straight conductor carrying current
C) solenoid carrying current
D) circular coil carrying current.
Correct Answer: C
Solution :
A bar magnet is equivalent to a current carrying solenoid due to the following facts : (i) Both rest in north-south direction when suspended freely (ii) Both have two poles : north pole and the south pole. (iii) The like poles of both repel each other while the unlike poles attract each other.
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