The magnetic field inside a long straight solenoid is MCQ with Answer and Explanation

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The magnetic field inside a long straight solenoid is

A. Zero

B. Inversely proportional to current

C. Strong at ends and weak in middle

D. Uniform

Answer: Option D

Solution (By JKSSB Mock Tests)

Ideal solenoid interior has uniform magnetic field B = μ₀ n I, parallel to axis. Outside field weak. Used in electromagnets, relays. Uniformity for scientific instruments.

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Practice More Physics Questions

Question #1

Weight of 10 kg mass on Moon (g_moon ≈ g_earth/6) is:

A. 60 N

B. 10 N

C. 16.7 N

D. 100 N

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Correct Answer: Option C

Explanation:
Weight W = mg. On Earth: 10×10 = 100 N. On Moon: g_moon ≈ 10/6 ≈ 1.67 m/s². W_moon = 10×1.67 ≈ 16.7 N. Mass remains 10 kg; weight changes with gravity. Memory tip: 'Mass constant; weight ∝ g'. Tests mass-weight distinction and gravity variation, common conceptual question in competitive exams.

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Question #2

The power dissipated in a pure inductor in AC circuit is

A. V²/R

B. Zero

C. VI

D. I²R

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Correct Answer: Option B

Explanation:
Phase difference 90°, power factor zero, average power zero.

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Question #3

The process of transfer of heat in fluids by actual movement of particles is called

A. Convection

B. Evaporation

C. Conduction

D. Radiation

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Correct Answer: Option A

Explanation:
Convection requires medium, movement of hot and cold masses. Land/sea breeze, trade winds, heating water. Conduction vibration transfer without particle movement.

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