- ATo detect presence of charge on a body.
- BTo determine the nature of charge on a body.
- CTo measure the exact amount of charge on a body.
- DFor both A and B.
Explanation:
Electroscope is a device which is use to detect whether a body is carrying charge and also to detect the nature of charge on the body.
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A screen is placed a distance 40cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens:
$\text{E}_0\text{k}=\text{B}_0\omega$
$\text{E}_0\text{B}_0=\omega\text{k}$
$\text{E}_0\omega=\text{B}_0\text{k}$
In a common base amplifier circuit, calculate the change in base current if that in the emitter current is 2 mA and a = 0.98
|
(a) 0.04 mA |
(b) 1.96 mA |
(c) 0.98 mA |
(d) 2 mA |
A charge q is located at the centre of a cube. The electric flux through any face is
|
(a) |
(b) |
(c) |
(d) |
The phenomena involved in the reflection of radiowaves by ionosphere is similar to:
Sodium has body centred packing. If the distance between two nearest atoms is 3.7 Å, then its lattice parameter is
|
(a) 4.8 Å |
(b) 4.3 Å |
(c) 3.9 Å |
(d) 3.3 Å |
In a P-N junction diode if P region is heavily doped than n region then the depletion layer is
|
(a) Greater in P region |
|
(b) Greater in N region |
|
(c) Equal in both region |
|
(d) No depletion layer is formed in this case |