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Physics · PYQ NEET UG 2020
हिन्दीA long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is (\( \mu_0 = 4\pi \times 10^{-7}\text{ T m A}^{-1} \))
Correct answer · Option 4
\( 6.28 \times 10^{-4}\text{ T} \)
Explanation
Magnetic field \( B = \mu_0 n I = \mu_0 (\frac{N}{L}) I = (4\pi \times 10^{-7}) \times (\frac{100}{0.5}) \times 2.5 = 6.28 \times 10^{-4}\text{ T} \).
