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Magnetism and M...

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  • Question 1
    4 / -1

    An electron of charge e moves in a circular orbit of radius r around the nucleus at a frequency v. The magnetic moment associated with the orbital motion of the electron is

  • Question 2
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    A bar magnet when placed at an angle of 30° to the direction of magnetic field induction of 5 × 10-2 T, experiences a moment of couple 25 × 10 -6 Nm. If the length of the magnet is 5 cm, then its pole strength is

  • Question 3
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    A magnet of magnetic moment 20 CGS units is freely suspended in a uniform magnetic field of intensity 0.3 CGS units. The amount of work done in deflecting it by an angle of 30° in CGS units is

  • Question 4
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    At a point on the right bisector of a magnetic dipole the magnetic

  • Question 5
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    The magnetic lines of force inside a bar magnet

  • Question 6
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    The effect due to uniform magnetic field on a freely suspended magnetic needle is as follows

  • Question 7
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    The intensity of magnetic field due to an isolated pole of strength m at a point distant r from it will be

  • Question 8
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    If the B–H curves of two samples of P and Q of iron are as shown below, then which one of the following statements is correct?

  • Question 9
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    Needles N1 , N2 and N3 are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will

  • Question 10
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    The magnetic needle has magnetic moment 8.7 × 10-2 Am2 and moment of inertia 11.5 × 10-6 kg m2. It performs 10 complete oscillations in 6.70 s, what is the magnitude of the magnetic field?

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