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The number of turns per unit length of a...

The number of turns per unit length of a solenoid is 10. If its average radius is 5 cm and it carries a current of 10A, then the ratio of flux densities obtained at the centre and at the end on the axis will be -

A

`1 : 2`

B

`2 : 1`

C

`1 : 1`

D

`1 : 4`

Text Solution

Verified by Experts

The correct Answer is:
B
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