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Q.

A long solenoid of 50 cm length having100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is: μ0=4π×10−7TmA−1

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a

3.14 x 10−4T

b

6.28 x 10−5T

c

3.14 x 10−5T

d

6.28 x 10−4T

answer is D.

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Detailed Solution

B=μ0nI=4πx10−7x1000.5x2.5=2πx10−4T=6.28x10−4T
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