1. Equal charges are given to two spheres of
different radii. The potential will
a) Be more on the smaller sphere
b) Be more on the bigger sphere
c) Be equal on both the spheres
d) Depend on the nature of the materials of the
spheres
Explanation:
2. An alpha particle is accelerated through a
potential difference of 106 volt. Its kinetic energy
will be
a) 1 MeV
b) 2 MeV
c) 4 MeV
d) 8 MeV
Explanation:
3.A charge of 5 C is given a displacement of 0.5 m.
The work done in the process is 10 J . The
potential difference between the two points will
be
a) 2 V
b) 0.25 V
c) 1 V
d) 25 V
Explanation:
4.The electric potential V is given as a function of
distance x (metre) by \[V=\left(5x^{2}+10x-9\right)volt\] . Value
of electric field at \[x=1\] is
a) 20 V/m
b) 6 V/m
c) 11 V/m
d) -23 V/m
Explanation:
5. Two metal pieces having a potential difference of 800 V are 0.02 m apart horizontally. A particle of
mass \[1.96\times10^{-15}kg\] is suspended in equilibrium
between the plates. If e is the elementary charge,
then charge on the particle is
a) e
b) 3e
c) 6e
d) 8e
Explanation:
6. 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) \[a^{2}/b^{2}\]
d) \[b^{2}/a^{2}\]
Explanation:
7. A particle of mass m and charge q is placed at
rest in a uniform electric field E and then
released. The kinetic energy attained by the
particle after moving a distance y is
a) \[qEy^{2}\]
b) \[qE^{2}y\]
c) qEy
d) \[q^{2}Ey\]
Explanation: Kinetic energy = Force Displacement = qEy
8. A hollow insulated conducting sphere is given a
positive charge of \[10\mu C\] . What will be the electric
field at the centre of the sphere if its radius is 2
meters
a) Zero
b) 5 \[\mu Cm^{-2}\]
c) 20 \[\mu Cm^{-2}\]
d) 8 \[\mu Cm^{-2}\]
Explanation: The intensity of electric field inside a hollow conducting sphere is zero.
9.A cube of side b has a charge q at each of its
vertices. The electric field due to this charge
distribution at the centre of this cube will be
a) \[q / b^{2}\]
b) \[q / 2b^{2}\]
c) \[32q / b^{2}\]
d) Zero
Explanation: Due to symmetric charge distribution
10. A charged water drop whose radius is 0.1 \[\mu m\] is in
equilibrium in an electric field. If charge on it is
equal to charge of an electron, then intensity of
electric field will be (g=10 m \[s^{-1})\]
a) 1.61 N /C
b) 26.2 N /C
c) 262 N /C
d) 1610 N /C
Explanation:
