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Question

For a given solenoid, a constant current of 0.2 A is flowing, initially there were 500 turns for 0.5 m length of solenoid. What will be the ratio of magnetic field at the centre of solenoid if the number of turns is increased to 2000 and length 1.5 m keeping the current constant.

A
1:2
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B
2:3
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C
4:3
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D
3:4
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