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Q.

The magnetic field strength of each magnet reduces to half when it cuts along its length into the equal parts of a solenoid. The polarity of the solenoid can be determined by

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a

Use of compass needle

b

Right-hand thumb rule

c

Heming left-hand rule

d

Either 1 or 2

answer is D.

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Detailed Solution

Polarity of the solenoid can be determined by using either the use of a compass needle or right-hand thumb rule.
The right-hand thumb rule is used for the current to find out the polarity of the solenoid. In the right-hand thumb rule, the right thumb is pointed in the direction that carries the current in a coiled wire of a solenoid, and the fingers are curled. The polarity of the solenoid can also be determined by using the compass needle.
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