Explanation:
Because the charge always remains conserved in an isolated system, it will remain the same.
Now,
$\text{V}=\frac{\text{Qd}}{\in_0\text{A}}$
Here, Q, A and d are the charge, area and distance between the plates, respectively.
Thus, as d increases, V increases.
Energy is given by:
$\text{E}=\frac{\text{qV}}{2}$
So, it will also increase.
Energy density u, that is, energy stored per unit volume in the electric field is given by:
$\text{u}=\frac{1}{2}\in_0\text{E}^2$
So, u will remain constant with increase in distance between the plates.
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In case of a semiconductor, which of the following statement is wrong
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(a) Doping increases conductivity |
|
(b) Temperature coefficient of resistance is negative |
|
(c) Resisitivity is in between that of a conductor and insulator |
|
(d) At absolute zero temperature, it behaves like a conductor |
A bar magnet of length 10 cm and having the pole strength equal to 10–3 weber is kept in a magnetic field having magnetic induction (B) equal to 
Tesla. It makes an angle of 30o with the direction of magnetic induction. The value of the torque acting on the magnet is
(
|
(a) 2π |
(b) 2 π |
(c) 0.5 N |
(d) 0.5 |
The speed of an electron having a wavelength of 
is
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(a) 7.25 |
(b) 6.26 |
(c) 5.25 |
(d) 4.24 |
A charge +Q is moving upwards vertically. It enters a magnetic field directed to the north. The force on the charge will be towards
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(a) North |
(b) South |
(c) East |
(d) West |
