Two long conductors, separated by a distance d carry current I1 and I2 in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its directions is reversed. The distance is also increased to 3d. The new value of the force between them is
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(a) –2F |
(b) F/3 |
(c) 2F/3 |
(d) – F/3 |
(c) 2F/3
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If the energy of a photon corresponding to a wavelength of 6000 Å is 3.32 
, the photon energy for a wavelength of 4000 Å will be
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(a) 1.4 eV |
(b) 4.9 eV |
(c) 3.1 eV |
(d) 1.6 eV |
In the circuit element given here, if the potential at point B, VB = 0, then the potentials of A and D are given as
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(a) |
(b) |
|
(c) |
(d) |
Assertion : Corpuscular theory fails in explaining the velocities of light in air and water.
Reason : According to corpuscular theory, light should travel faster in denser medium than, in rarer medium.
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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. |
ABC is an equilateral triangle. Charges + q are placed at each corner. The electric intensity at O will be
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(a) |
(b) |
(c) Zero |
(d) |
