A certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of 45°. If the current be reduced by a factor of 
, the deflection would
| (a) Decrease by 30° | (b) Decrease by 15° | (c) Increase by 15° | (d) Increase by 30° |
(b) Decrease by 15°
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Switch S of the circuit shown in figure. is closed at t = 0. If e denotes the induced
emf in L and i, the current flowing through the circuit at time t, which of the following graphs is correct
|
(a)
|
(b)
|
(c)
|
(d)
|
In the circuit shown in figure, each capacitor has a capacity of 3μF. The equivalent capacity between A and B is
|
(a) |
(b) 3 |
(c) 6 |
(d) 5 |
In sum and difference method in vibration magnetometer, the time period is more if
| (a) Similar poles of both magnets are on same sides |
| (b) Opposite poles of both magnets are on same sides |
| (c) Both magnets are perpendicular to each other |
| (d) Nothing can be said |
Intensity of X-rays depends upon the number of
|
(a) Electrons |
(b) Protons |
(c) Neutrons |
(d) Positrons |
A charged particle is suspended in equilibrium in a uniform vertical electric field of intensity 20000 V/m. If mass of the particle is 9.6 
, the charge on it and excess number of electrons on the particle are respectively (g = 
|
(a) 4.8 |
(b) 5.8 |
(c) 3.8 |
(d) 2.8 |
