The energy stored in an inductor of inductance L carrying current I is MCQ with Answer and Explanation

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The energy stored in an inductor of inductance L carrying current I is

A. ½LI²

B. L²I

C. LI²

D. ½LI

Answer: Option A

Solution (By JKExamLibrary)

Magnetic energy stored = ½ L I², analogous to capacitor energy ½ C V². L is inductance in henry (H). Energy stored in magnetic field.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The number of protons in an atom determines its

A. Atomic number

B. Neutron number

C. Mass number

D. Isotope

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Correct Answer: Option A

Explanation:
Atomic number Z = number of protons. Defines chemical element. Mass number = protons + neutrons. Isotopes same Z, different neutrons. Isobars same A, different Z.

This question belongs to: Science Physics

Question #2 Report Error

The speed of sound in air at 0°C is 331 m/s. At 22°C, approximately

A. 350 m/s

B. 360 m/s

C. 331 m/s

D. 343 m/s

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Correct Answer: Option D

Explanation:
v ≈ 331 + 0.6×T(°C) = 331 + 0.6×22 = 331+13.2 = 344.2 m/s, nearest 343 m/s.

This question belongs to: Science Physics

Question #3 Report Error

In elastic collision, which quantity is always conserved?

A. Velocity

B. Momentum only

C. Both momentum and kinetic energy

D. Kinetic energy only

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Correct Answer: Option C

Explanation:
Elastic collisions conserve both total momentum and total kinetic energy. Inelastic collisions conserve only momentum. This distinction is fundamental in collision analysis. Memory aid: 'Elastic = KE + momentum conserved; Inelastic = momentum only'. Frequently tested concept to differentiate collision types in competitive exam mechanics sections.

This question belongs to: Science Physics

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