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

The energy stored in an inductor of inductance L carrying current I is
A. LI²
B. L²I
C. ½LI
D. ½LI²
Answer: Option D
Solution (By JKSSB Mock Tests)
Magnetic energy stored = ½ L I², analogous to capacitor energy ½ C V². L is inductance in henry (H). Energy stored in magnetic field.

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Practice More Physics Questions

Question #1
The buoyant force on a body immersed in a fluid depends on
A. Both B and C
B. Volume of body
C. Density of body
D. Acceleration due to gravity

Correct Answer: Option A


Explanation:
Buoyant force = weight of displaced fluid = (volume of body submerged) × density_fluid × g. Depends on volume displaced and g. Not density of body.

This question belongs to: Science Physics
Question #2
The dimensional formula of pressure is
A. [ML⁻¹T⁻²]
B. [M⁰L⁻¹T⁻²]
C. [ML²T⁻²]
D. [MLT⁻²]

Correct Answer: Option A


Explanation:
Pressure = Force/Area. Force = mass × acceleration, dimensions [MLT⁻²]. Area = L². So pressure = [MLT⁻²]/[L²] = [ML⁻¹T⁻²]. This is also the dimension of stress. Common exam trap: confuse with energy density which is also [ML⁻¹T⁻²].

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Question #3
One astronomical unit (AU) is the
A. Radius of Earth
B. Distance travelled by light in one year
C. Distance between Earth and Moon
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Correct Answer: Option D


Explanation:
1 AU ≈ 1.5 × 10⁸ km, average Earth-Sun distance.

This question belongs to: Science Physics