An electron of mass m and charge e is accelerated from rest through a potential difference V in vacuum. The final speed of the electron will be
|
(a) |
(b) |
(c) |
(d) 2eV/m |
(c) 
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A radioactive substance emits
|
(a) Electromagnetic radiation |
(b) Electrons revolving around the nucleus |
|
(c) Charged particles |
(d) a,c |
Assertion : Circuit containing capacitors should be handled cautiously even when there is no current.
Reason : The capacitors are very delicate and so quickly break down.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
If there are n capacitors in parallel connected to V volt source, then the energy stored is equal to
|
(a) CV |
(b) |
(c) |
(d) |
What is the equivalent capacitance between A and B in the given figure (all are in farad)
|
(a) |
(b) |
(c) |
(d) |
Three charges Q, +q and +q are placed at the vertices of a right-angled isosceles triangle as shown. The net electrostatic energy of the configuration is zero if Q is equal to
|
(a) |
(b) |
(c) -2q |
(d) +q |
In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become
|
(a) Double |
(b) Half |
(c) Four time |
(d) No change |
