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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 boat which has a speed of 5 kmh⁻¹ in still water crosses river of width 1 km long
- A string is stretched between fixed points seperated by 75 cm. It is observed
- A boy is trying to start a fire by focusing sunlight on a piece of paper using
- Rate of photoelectric emission is proportional to
- A metal rod of length l cuts across a uniform magnetic field B with a velocity 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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