Explanation:
Force will decreases because when medium is inserted between then it will reduces the forces by its permitivity. the force becomes
$\text{Fe}_\text{m}=\frac{\text{Fe}}{\in_\text{r}}$
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The resistance of a galvanometer is 50 ohms and the current required to give full scale deflection is 100μA. In order to convert it into an ammeter, reading upto 10A, it is necessary to put a resistance of
|
(a) 5 |
(b) 5 |
|
(c) |
(d) 99,950 |
The sun is rotating about its own axis. The spectral lines emitted from the two ends of its equator, for an observer on the earth, will show
|
(a) Shift towards red end |
|
(b) Shift towards violet end |
|
(c) Shift towards red end by one line and towards violet end by other |
|
(d) No shift |
In the given figure each plate of capacitance C has partial value of charge
|
(a) CE |
(b) |
(c) |
(d) |
In an RC circuit while charging, the graph of in i versus time is as shown by the dotted line in the diagram figure, where i is the current. When the value of the resistance is doubled, which of the solid curve best represents the variation of in i versus time
|
(a) P |
(b) Q |
(c) R |
(d) S |
If a = 0.98 and current through emitter ie = 20 mA, the value of b is
|
(a) 4.9 |
(b) 49 |
(c) 96 |
(d) 9.6 |
