In the circuit given below, V(t) is the sinusoidal voltage source, voltage drop VAB(t) across the resistance R is
|
(a) Is half wave rectified |
|
(b) Is full wave rectified |
|
(c) Has the same peak value in the positive and negative half cycles |
|
(d) Has different peak values during positive and negative half cycle |
(d) Has different peak values during positive and negative half cycle
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Two parallel wires of length 9 m each are separated by a distance 0.15 m. If they carry equal currents in the same direction and exerts a total force of 30 × 10–7 N on each other, then the value of current must be
|
(a) 2.5 amp |
(b) 3.5 amp |
(c) 1.5 amp |
(d) 0.5 amp |
To get the maximum current from a parallel combination of n identical cells each of internal resistance r in an external resistance R, when
|
(a) R >> r |
(b) R << r |
(c) R = r |
(d) None of these |
$\text{Zero.}$
$\text{Mga}$
$\text{Mga}\sin\theta$
$\frac{1}{2}\text{Mga}\sin\theta$
Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of electric field of the spheres is
|
(a) a/b |
(b) b/a |
(c) |
(d) |
In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of
| (a) 1 MeV | (b) 0.1 MeV |
(c) 1eV |
(d) 5 eV |
The capacities of two conductors are 
and 
and their respective potentials are 
and 
. If they are connected by a thin wire, then the loss of energy will be given by
|
(a) |
(b) |
(c) |
(d) |
Two magnets, each of magnetic moment ‘M’ are placed so as to form a cross at right angles to each other. The magnetic moment of the system will be
|
(a) 2M |
(b) |
(c) 0.5 M |
(d) M |
