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JEE Main202529 Jan 2025Evening ShiftPhysicsMagnetic Effects of CurrentActual

The magnetic field inside a 200 turns solenoid of radius 10 cm is 2.9 10⁻⁴ Tesla . If the solenoid carries a current of 0.29 A , then the length of the solenoid is ________ cm .

Correct answer

0

Step-by-step solution

Assuming long solenoid aligned & B = ₀ ( ~N ) i & = ₀ Ni ~B = (4 10⁻⁷ )(200)(0.29) 2.9 10⁻⁴ ~m & =8 ~cm aligned

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