Explanation:
Electric field due to Q & q, inside the spherical shell is zero.
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The current in a coil changes from 4 ampere to zero in 0.1 s. If the average e.m.f. induced is 100 volt, what is the self inductance of the coil
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(a) 2.5 H |
(b) 25 H |
(c) 400 H |
(d) 40 H |
Two nucleons are at a separation of 1 
. The net force between them is 
, if both are neutrons, 
if both are protons and 
if one is a proton and other is a neutron. In such a case
|
(a) |
(b) |
(c) |
(d) |
The capacity of a parallel plate capacitor with no dielectric substance but with a separation of 0.4 cm is 2 μF. The separation is reduced to half and it is filled with a dielectric substance of value 2.8. The final capacity of the capacitor is
|
(a) 11.2 μF |
(b) 15.6 μF |
(c) 19.2 μF |
(d) 22. 4 μF |
Assertion : A laser beam 0.2 W power can drill holes through a metal sheet, whereas 1000 W torch-light cannot.
Reason : The frequency of laser light is much higher then that of torch light.
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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. |
The de-Broglie wavelength l
|
(a) is proportional to mass |
(b) is proportional to impulse |
|
(c) Inversely proportional to impulse |
(d) does not depend on impulse |
A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second [e = 1.6 × 10–19 Coulomb]
|
(a) 6.25 × |
(b) 6.25 × |
(c) 6.25 × |
(d) 6.25 × |
E denotes electric field in a uniform conductor, I corresponding current through it, 
drift velocity of electrons and P denotes thermal power produced in the conductor, then which of the following graph is incorrect
|
(a)
|
(b)
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(c)
|
(d)
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