- ASouth pole to north pole.
- BNorth pole to south pole.
- CEast to west.
- DWest to east.
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Photon of 5.5 eV energy fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 4.0 eV. The stopping voltage required for these electrons are
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(a) 5.5 V |
(b) 1.5V |
(c) 9.5V |
(d) 4.0V |
Assertion : The ferromagnetic substance do not obey Curie’s law.
Reason : At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A wave is propagating in a medium of electric dielectric constant 2 and relative magnetic permeability 50. The wave impedance of such a medium is
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(a) 5 W |
(b) 376.6 W |
(c) 1883 W |
(d) 3776 W |
A charged particle q is shot towards another charged particle Q which is fixed, with a speed v. It approaches Q upto a closest distance r and then returns. If q were given a speed 2v, the closest distances of approach would be
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(a) r |
(b) 2r |
(c) r/2 |
(d) r/4 |
The critical angle of a medium with respect to air is 45°. The refractive index of medium is
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(a) 1.41 |
(b) 1.2 |
(c) 1.5 |
(d) 2 |
Magnets A and B are geometrically similar but the magnetic moment of A is twice that of B. If T1 and T2 be the time periods of the oscillation when their like poles and unlike poles are kept together respectively, then
will be
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(a) |
(b) |
(c) |
(d) |