The value of workdone for rotating a magnet of magnetic moment M by an angle θ in external magnetic field H is given by
Options
(a) MH cos θ (b) 2MH sin²(θ/2) (c) MH […]
A paramagnetic sample shows a net magnetisation of 0.8 Am⁻¹, when placed in an external magnetic field of strength 0.8 T at a temperature 5K. When the same sample is placed in an externel magnetic […]
A cyclotron is used to accelerate
Options
(a) Only negatively charged particles (b) neutron (c) Both positively and negatively charged particles (d) Only positively charged particles
Correct Answer:
Only positively charged particles
Explanation: […]
If a magnetic substance is brought near the north or the south pole of a bar magnet, it is:
Options
(a) repelled by the north pole and attracted by the south pole (b) […]
A susceptibility of a certain magnetic material is 400. What is the class of the magnetic material?
Options
(a) Diamagnetic (b) Paramagnetic (c) Ferromagnetic (d) Ferroelectric
Correct Answer:
Ferromagnetic
Explanation:
No explanation available. […]
A proton beam enters a magnetic field of 10⁻⁴ Wb/m² normally. If the specific charge of the proton is 10¹¹ C/kg and its velocity is 10⁹ m/s, then the radius of the circle described will […]
A freely suspended bar magnet aligns itself in
Options
(a) A direction (b) A particular direction (c) Any direction (d) Depends on mass of target
Correct Answer:
A particular direction
Explanation:
A freely suspended […]
There is a ring of radius r having linear charge density λ and rotating with a uniform angular velocity ω. The magnetic field produced by this ring at its own centre would be
Options […]
Magnetism of a magnet is due to
Options
(a) Cosmic rays (b) Large magnet at the centre of Earth (c) Spins of electrons (d) Gravitation
Correct Answer:
Spins of electrons
Explanation:
No explanation […]
Magnetism of a magnet is due to
Options
(a) Cosmic rays (b) Large magnet at the centre of Earth (c) Spins of electrons (d) Gravitation
Correct Answer:
Spins of electrons
Explanation:
Spins of electrons […]
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