- AFor all conductors.
- BOnly for spherical conductors.
- CFor hollow conductors.
- DFor those conductors which don’t have sharp edges.
Explanation:
Charge remains on the outer surface of a conductor, irrespective of the shape and size of the conductor and also for hollow and solid conductors both. But if there is a sharp edge in the conductor, surface charge density will be more at that point. The surface charge density is uniform in the case of a sphere.
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A capacitor of capacity is charged upto V volt and then connected to an uncharged capacitor of capacity
. Then final potential difference across each will be
|
(a) |
(b) |
(c) |
(d) |
In a parallel beam of white light is incident on a converging lens, the colour which is brought to focus nearest to the lens is
|
(a) Violet |
(b) Red |
|
(c) The mean colour |
(d) All the colours together |
If a unit positive charge is taken from one point to another over an equipotential surface, then
|
(a) Work is done on the charge |
(b) Work is done by the charge |
|
(c) Work done is constant |
(d) No work is done |
The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature
|
(a) Decreases exponentially with increasing band gap |
|
(b) Increases exponentially with increasing band gap |
|
(c) Decreases with increasing temperature |
|
(d) Is independent of the temperature and the band gap |
Which one of the following statements is not correct
|
(a) A diode does not obey Ohm's law |
|
(b) A PN junction diode symbol shows an arrow identifying the direction of current (forward) flow |
|
(c) An ideal diode is an open switch |
|
(d) An ideal diode is an ideal one way conductor |
Assertion : When the speed of an electron increases its specific charge decreases.
Reason : Specific charge is the ratio of the charge to mass.
|
(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. |
An oscillator is nothing but an amplifier with
|
(a) Positive feed back |
(b) Large gain |
|
(c) No feedback |
(d) Negative feedback |