A capacitor having capacitance C is charged to a voltage V. It is then removed and connected in parallel with another identical capacitor which is uncharged. The new charge on each capacitor is now
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(a) CV |
(b) CV / 2 |
(c) 2 CV |
(d) CV / 4 |
(b) CV / 2
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A 100 ohm galvanometer gives full scale deflection at 10 mA. How much shunt is required to read 100 mA
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(a) 11.11 ohm |
(b) 9.9 ohm |
(c) 1.1 ohm |
(d) 4.4 ohm |
The net resistance of a voltmeter should be large to ensure that
|
(a) It does not get overheated |
|
(b) It does not draw excessive current |
|
(c) It can measure large potential difference |
|
(d) It does not appreciably change the potential difference to be measured |
In order to coincide the parabolas formed by singly ionised ions in one spectrograph and doubly ionized ions in the other Thomson’s mass spectrograph, the electric fields and magnetic fields are kept in the ratios 1 : 2 and 3 : 2 respectively. Then the ratio of masses of the ions is
|
(a) 3 : 4 |
(b) 1 : 3 |
(c) 9 : 4 |
(d) None of these |
The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be
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(a) Horizontal |
(b) Vertical |
(c) Clockwise |
(d) Anticlockwise |
The fine powder of a coloured glass is seen as
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(a) Coloured |
(b) White |
|
(c) That of the glass colour |
(d) Black |
Two identical parallel plate capacitors are connected in series to a battery of 100 V. A dielectric slab of dielectric constant 4.0 is inserted between the plates of second capacitor. The potential difference across the capacitors will now be respectively
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(a) 50 V, 50 V |
(b) 80 V, 20 V |
(c) 20 V, 80 V |
(d) 75 V, 25 V |
$\text{3V}\cos\theta$
$2\text{V}\cos\theta$
$\frac{3}{2}\text{V}\cos\theta$
$\text{V}\cos\theta$
Which of the following is most unstable
|
(a) Electrons |
(b) Protons |
(c) Neutrons |
(d) α -particle |