In Bainbridge mass spectrograph a potential difference of 1000 V is applied between two plates distant 1 cm apart and magnetic field in B = 1T. The velocity of undeflected positive ions in m/s from the velocity selector is
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(a) |
(b) |
(c) |
(d) |
(c) 
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If identical charges (-q) are placed at each corner of a cube of side b, then electric potential energy of charge (+q) which is placed at centre of the cube will be
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(a) |
(b) |
(c) |
(d) |
A parallel plate capacitor of plate area A and plate separation d is charged to potential V and then the battery is disconnected. A slab of dielectric constant k is then inserted between the plates of the capacitors so as to fill the space between the plates. If Q, E and W denote respectively, the magnitude of charge on each plate, the electric field between the plates (after the slab is inserted) and work done on the system in question in the process of inserting the slab, then state incorrect relation from the following
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(a) |
(b) |
(c) |
(d) |
Which of the following is the fusion reaction
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(a) |
(b) |
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(c) |
(d) |
If a resistance 
is connected in parallel with the resistance R in the circuit shown, then possible value of current through R and the possible value of will be
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(a) |
(b) I, 2R |
(c) |
(d) |
In the circuit shown below, The reading of the voltmeter V is
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(a) 12 V |
(b) 8 V |
(c) 20 V |
(d) 16 V |
In a tangent galvanometer a current of 0.1 A produces a deflection of 30o. The current required to produce a deflection of 60o is
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(a) 0.2 A |
(b) 0.3 A |
(c) 0.4 A |
(c) 0.5 A |
