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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
- In a transistor, the value of βis 100, then the value of α will be
- Two bulbs 40 watt and 60 watt and rated voltage 240 V are connected in series
- A bullet of mass 0.05 kg moving with a speed of 80 m/s enters a wooden
- A radioactive nucleus of mass M emits a photon of frequency v and the nucleus recoils.
- If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits
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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