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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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A long solenoid is formed by winding 20 turns/cm. The current necessary to produce a magnetic field of 20 millitesla inside the solenoid will be approximately

\left(\frac{\mu_0}{4 \pi}=10^{-7} \text { tesla }- \text { metre } / \text { ampere }\right)

View answer and explanation

Correct option: A

8.0 \mathrm{~A}

Option A (8.0 A) is correct because it accurately calculates the current required to produce the given magnetic field inside the solenoid using the formula

B = \mu_0 n i

.

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