1. Angle between equipotential surface and lines of
force is
a) Zero
b) \[180^{\circ}\]
c) \[90^{\circ}\]
d) \[45^{\circ}\]
Explanation: Lines of force is perpendicular to the equipotential surface. Hence angle = 90o
2. The unit of electric field is not equivalent to
a) N / C
b) J / C
c) V / m
d) J / C-m
Explanation: J / C
3.A flat circular disc has a charge \[+Q\] uniformly
distributed on the disc. A charge \[+q\] is thrown
with kinetic energy E towards the disc along its
normal axis. The charge q will
a) Hit the disc at the centre
b) Return back along its path after touching the
disc
c) Return back along its path without touching
the disc
d) Any of the above three situations is possible
depending on the magnitude of E
Explanation: Any of the above three situations is possible depending on the magnitude of E
4. At a certain distance from a point charge the
electric field is 500 V /m and the potential is
3000 V . What is this distance
a) 6m
b) 12m
c) 36m
d) 144m
Explanation:
5.The magnitude of electric field E in the annular
region of a charged cylindrical capacitor
a) Is same throughout
b) Is higher near the outer cylinder than near the
inner cylinder
c) Varies as 1 / r , where r is the distance from
the axis
d) Varies as 1 / r2 , where r is the distance from
the axis
Explanation:
6. A metallic solid sphere is placed in a uniform
electric field. The lines of force follow the path(s)
shown in figure as
a) 1
b) 2
c) 3
d) 4
Explanation: The electric field is always perpendicular to the surface of a conductor. On the surface of a metallic solid sphere, the electrical field is oriented normally (i.e. directed towards the centre of the sphere).
7. The distance between a proton and electron both
having a charge \[1.6\times 10^{-19}coulomb\] , of a hydrogen
atom is \[ 10^{-10}metre\] . The value of intensity of
electric field produced on electron due to proton
will be
a) \[2.304\times 10^{-10}N/ C\]
b) 14.4 v/ m
c) 16 v/ m
d) \[1.44\times 10^{11}N/ C\]
Explanation:
8. What is the magnitude of a point charge due to
which the electric field 30 cm away has the
magnitude [E=2 newton/coulomb , \[1/4\pi\epsilon_{o}= 9 \times 10^{9}Nm^{2}/C^{2}\] ]
a) \[2\times 10^{-11}coulomb\]
b) \[3\times 10^{-11}coulomb\]
c) \[5\times 10^{-11}coulomb\]
d) \[9\times 10^{-11}coulomb\]
Explanation:
9.Two charge \[+q\] and \[-q\] are situated at a certain
distance. At the point exactly midway between
them
a) Electric field and potential both are zero
b) Electric field is zero but potential is not zero
c) Electric field is not zero but potential is zero
d) Neither electric field nor potential is zero
Explanation:
10. Two positive charges of 20 coulomb and
Q coulomb are situated at a distance of 60 cm . The
neutral point between them is at a distance of 20 cm from the 20 coulomb charge. Charge Q is
a) 30 C
b) 40 C
c) 60 C
d) 80 C
Explanation:
