Two capacitors connected in parallel having the capacities 
and 
are given ‘q’ charge, which is distributed among them. The ratio of the charge on and will be
|
(a) |
(b) |
(c) |
(d) |
(a) 
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Size of nucleus is of the order of
|
(a) |
(b) |
(c) |
(d) |
An electric motor operates on a 50 volt supply and a current of 12A. If the efficiency of the motor is 30%, what is the resistance of the winding of the motor
|
(a) 6 Ω |
(b) 4 Ω |
(c) 2.9 Ω |
(d) 3.1 Ω |
There are certain types of stars called visible stars which undergo periodic change in their light output. If such a star quadruple it's light output, how much does it's magnitude change
|
(a) – 1.25 |
(b) – 1.5 |
(c) – 1.75 |
(d) – 2 |
Two concentric coplanar circular loops of radii 
and 
carry currents of respectively 
and 
in opposite directions (one clockwise and the other anticlockwise.) The magnetic induction at the centre of the loops is half that due to alone at the centre. If 
. the value of 
is
|
(a) 2 |
(b) 1/2 |
(c) 1/4 |
(d) 1 |
A uniform conducting wire ABC has a mass of 10g. A current of 2A flows through it. The wire is kept in a uniform magnetic field B = 2T. The acceleration of the wire will be
| (a) Zero |
(b) 12  along y-axis
|
(c) 1.2  along y-axis
|
(d) 0.6 along y - axis
|
