Two long parallel wires are at a distance 2d apart. They carry steady equal currents flowing out of the plane of the paper, as shown. The variation of the magnetic field B along the line XX’ is given by
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(a)
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(b)
|
(c)
|
(d)
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(b)
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A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer surface of the hollow shell be V. If the shell is now given a charge of –3Q, the new potential difference between the same two surfaces is
|
(a) V |
(b) 2V |
(c) 4V |
(d) – 2V |
In terms of Rydberg's constant R, the wave number of the first Balmer line is
|
(a) R |
(b) 3R |
(c) |
(d) |
How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container (given that a
= 4/3)
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(a) 8.0 cm |
(b) 10.5 cm |
(c) 12.0 cm |
(d) None of the above |
Which of the following phenomena can explain quantum nature of light
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(a) Photoelectric effect |
(b) Interference |
(c) Diffraction |
(d) Polarisation |
Magnetic lines of force due to a bar magnet do not intersect because
|
(a) A point always has a single net magnetic field |
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(b) The lines have similar charges and so repel each other |
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(c) The lines always diverge from a single point |
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(d) The lines need magnetic lenses to be made to intersect |
Two similar coils are kept mutually perpendicular such that their centres coincide. At the centre, find the ratio of the magnetic field due to one coil and the resultant magnetic field by both coils, if the same current is flown
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(a) 1: |
(b) 1 : 2 |
(c) 2 : 1 |
(d) |
