Indian Navy INET Moving Charges and Magnetism — practice questions

Explore 2 free Moving Charges and Magnetism questions in Indian Navy INET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Moving Charges and Magnetism questions and exercises with answers

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Magnetic field inside a long solenoid (n turns per unit length, current I):Read the answer and worked solution →In a velocity selector, electric field E and magnetic field B are perpendicular. Velocity of particles passing undeflected:Read the answer and worked solution →

Worked practice questions

Magnetic field inside a long solenoid (n turns per unit length, current I):

μ₀ I
μ₀ n I
μ₀ I / n
2 μ₀ n I

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Correct answer: B. μ₀ n I

**For ideal long solenoid:** B = μ₀ n I (uniform inside, zero outside). Independent of position. Used to create uniform magnetic fields in labs.

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In a velocity selector, electric field E and magnetic field B are perpendicular. Velocity of particles passing undeflected:

E/B
B/E
EB
E²/B

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Correct answer: A. E/B

**For undeflected motion:** electric force qE balances magnetic force qvB. So v = E/B. Only particles with this specific speed pass straight others are deflected. Used in mass spectrometers.