Magnetism — Practice Quiz
Maharashtra Board · Class 11 · Physics
Try a 4-question quiz on Magnetism for Maharashtra Board Class 11 Physics: tap an answer to check it and see why. 44 questions in the full chapter test.
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Quick Quiz: Magnetism
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What is the SI unit of magnetic field strength?
A bar magnet of magnetic moment 0.4 A m² is placed at a distance of 10 cm from a point P along its axis. Calculate the magnetic field at point P. (Given: μ₀ = 4π × 10⁻⁷ H/m)
What is the relationship between magnetic length and geometric length of a bar magnet?
At a certain location, the horizontal component of Earth's magnetic field is 3.0 × 10⁻⁵ T and the angle of dip is 30°. Calculate the vertical component of Earth's magnetic field.
Sample Questions
Which of the following statements about magnetic lines of force are correct?
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They form closed loops, They never intersect each other, They originate from north pole and end at south pole, Their density indicates field strength
Magnetic lines of force form closed loops, never intersect, originate from N-pole and end at S-pole, and their density indicates field strength. They cannot exist in isolation as magnetic monopoles don't exist.
The angle of dip at the magnetic equator is:
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0°
At the magnetic equator, the Earth's magnetic field is horizontal, so the angle of dip (inclination with horizontal) is 0°. The vertical component is zero at the magnetic equator.
According to Gauss' law for magnetism, the net magnetic flux through any closed surface is:
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Zero
Gauss' law for magnetism states that ∮B⃗·dS⃗ = 0. This is because magnetic monopoles do not exist, so magnetic field lines always form closed loops. The number of lines entering any closed surface equals the number leaving.
For a bar magnet, the ratio of axial field to equatorial field at the same distance is:
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2:1
For a bar magnet at distance r: Bₐₓᵢₛ = (μ₀/4π) × (2m/r³) and Bₑq = (μ₀/4π) × (m/r³). Therefore, Bₐₓᵢₛ : Bₑq = 2m : m = 2:1
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