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If r be the distance of a point on the axis of a magnetic dipole from its centre then the magnetic field at such a point is proportional to
Options
(a) 1/r
(b) 1/r²
(c) 1/r³
(d) none of these
Correct Answer:
1/r³
Explanation:
As we know that, the magnetic field at a point due to the dipole is given by B = (μ₀ / 4π) × (M / r³) × √(1 + 3 cos² θ) where, M is magnetic dipole moment. Then, B ∝ 1 / r³
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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 coil of N turns and mean cross-sectional area A is rotating with uniform angular
- which of the following can not be emitted by radioactive substances during their decay?
- A copper disc of radius 0.1 m is rotated about its centre, with 10 revolutions
- A coil has resistance 30 ohm and inductive reactance 20 ohmn at 50 Hz frequency.
- If μᵥ=1.5230 and μʀ=15.145, then dispersive power of crown glass is
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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