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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
- With the decrease of current in the primary coil from 2 amperes to zero value
- Suppose the kinetic energy of a body oscillating with amplitude A and at a distance
- A body of length 1 m having cross-sectional area 0.75 m² has heat flow through it
- A carnot engine working between 300 K and 600 K has a work output of 800J per cycle.
- A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V
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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