- ACharge, which is a fraction of charge on an electron, is not possible.
- BA charge cannot be destroyed.
- CCharge exists on particles.
- DThere exists a minimum permissible charge on a particle.
Explanation:
The quantisation of charge means that when we say something has some charge, we mean by that that how many times the charge of electrons it has. Because the whole charge is associated with an electron.
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The half-life of a radioactive substance is 3.6 days. How much of 20 mg of this radioactive substance will remain after 36 days
|
(a) 0.0019 mg |
(b) 1.019 mg |
(c) 1.109 mg |
(d) 0.019 mg |
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 |
Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10 W when a potential difference of 20 V is applied between its ends
|
(a) 120 C |
(b) 240 C |
(c) 20 C |
(d) 4 C |
A beam of light is converging towards a point I on a screen. A plane glass plate whose thickness in the direction of the beam = t, refractive index = μ, is introduced in the path of the beam. The convergence point is shifted by
|
(a) |
(b) |
(c) |
(d) |
According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum
|
(a) Energy and momentum |
(b) Speed and momentum |
|
(c) Speed only |
(d) Energy only |