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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
- The speed of an electron having a wavelength of 10⁻¹⁰ m is
- Two point charges +2 coulomb and +10 coulomb repel each other with a force of 12 N.
- A nucleus with mass number 220 initially at rest emits an α-particle. If the Q-value
- Six molecules have speeds 2 units, 5 units, 3 units, 6 units, 3 units and 5 units
- In which of the following systems will the radius of the first orbit (n=1) be minimum?
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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