Find out the value of current through 2
resistance for the given circuit
(a) 5 A (b) 2 A (c) Zero (d) 4 A
A group of N cells whose emf varies directly with
the internal resistance as per the equation
EN1.5rN are connected as shown in the figure
below. The current I in the circuit is
(a) 0.15 amp (b) 1.5 amp
(c) 5.1 amp (d) 0.51 amp
Two cells of emf’s approximately 5V and 10V are
accurately compared using a potentiometer of
length 400 cm.
(a) Potentiometer is usually used for comparing
resistances and not voltages
(b) The battery of potentiometer can have a voltage
of 15V and resistance of the wire is adjusted so
that the potential drop across the wire slightly
exceeds 10V
(c) The battery that runs the potentiometer should
have voltage of 8V
(d) The first portion of 50 cm of wire itself should
have a potential drop of 10V
In the circuit shown in Fig. C 1 2 .C 2 Intially,,
capacitor C 1 is charged to a potential of V. The
current in the circuit just after the switch S is closed
is
(a) 0 (b) 2 /V R (c) (d) V/ 2R
Two small spheres each of mass m and with a
charge q lie inside a nonconducting smooth
hemispherical bowl of radius R. Find q if the
equilibrium separation between the two charges is
d.
(a)
3
0
2
2
2
4
mg d
d
R
(b)
3
0
2 2
mg d
R d
(c)
3
0
2 2
mg d
R d
(d) mg d 0 3
The locus of the points (in the xy-plane) where the
electric field due to a dipole (dipole axis is along x-
axis and its equatorial is along y-axis) is
perpendicular to its axis, is
(a) Straight line perpendicular to the axis
(b) Straight line having inclination
tan 2^1 with the dipole axis
(c) Circle
(d) Parabola
Each capacitor in the circuit is of 4 F. When the
switch S is closed how much charge will flow
through AB?
39.
40.
41.
42.
(a) 320 C (b) 213 C
(c) 107 C (d) None of these
Find the potential difference V Va b between the
points a and b shown in the figure.
(a) -4V (b) -6V (c) -8V (d) -10V
