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The effective length of magnet is 31.4 cm and its pole strength is 0.8Am. The magnetic moment, if it is bent in the form of a semicircle is …….. A-m²
Options
(a) 1.2
(b) 1.6
(c) 0.16
(d) 0.12
Correct Answer:
0.16
Explanation:
The effective length of magnet = 31.4 cm
Pole strength, m = 0.8 Am
Length of semi-circle = π (D / 2) = l
where, D = diameter of circle
D = 2l / π = (2 × 31.4 × 10²) / 3.14 = 20 × 10⁻² m
Now, the magnetic moment = ml = mD = 0.8 × 20 × 10⁻² m
= 16 × 10⁻² = 0.16 A-m²
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Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A wire elongates by l mm when a load W is hanged from it. If the wire goes over
- The dual nature of light is exhibited by
- A spherical drop of mercury having a potential of 2.5 v is obtained as a result
- The velocity of a particle at an instant is 10 ms⁻¹.After 3 s its velocity will become
- Electrons of mass m with de-Broglie wavelength λ fall on the target in an X-ray tube.
Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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