Explanation:
A Van de Graff generator, by means of a moving belt and suitable brushes, transfers charge continuously to a large spherical conducting shell. As a result, a potential difference of the order of several million volts is built up and this can be used for accelerating charged particles.
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Two spheres A and B of radius 4cm and 6cm are given charges of 80 μC and 40 μC respectively. If they are connected by a fine wire, the amount of charge flowing from one to the other is
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(a) 20 μC from A to B |
(b) 16 μC from A to B |
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(c) 32 μC from B to A |
(d) 32 μC from A to B |
Source of Sun's energy is
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(a) Burning of hydrogen |
(b) Fission reactions involving hydrogen |
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(c) Fusion reactions involving hydrogen |
(d) Some other source |
Assertion : Electrons move away from a low potential to high potential region.
Reason : Because electrons has negative charge
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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 distance between the plates of a parallel plate condenser is 8mm and P.D. 120 volts. If a 6mm thick slab of dielectric constant 6 is introduced between its plates, then
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(a) The charge on the condenser will be doubled |
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(b) The charge on the condenser will be reduced to half |
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(c) The P.D. across the condenser will be 320 volts |
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(d) The P.D. across the condenser will be 45 volts |
An electron and proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is
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(a) Zero |
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(b) Infinity |
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(c) Equal to the kinetic energy of the proton |
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(d) Greater than the kinetic energy of the proton |