Electrostatic Potential and Capacitance
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1. The process in which a region is made free from any
electric field is known as _____________.
a. Electrostatic
forcing
b. Electrostatic
binding
c.
Electrostatic shielding
d. None of
the options
Answer: (c)
Electrostatic shielding
Explanation: Electrostatic
shielding is a phenomenon seen when a Faraday cage is used to block the effects
of an electric field. (
2. The formula for electrostatic potential is _____________.
a. Electrostatic
potential = Work done*charge
b. Electrostatic
potential = Work done/charge
c.
Electrostatic potential = Work done+charge
d. Electrostatic
potential = Work done-charge
Answer: (b)
Electrostatic potential = Work done/charge
Explanation: The
formula for electrostatic potential is Electrostatic potential = Work
done/charge.
3. 1 Volt = _____________ style-type: lower-alpha;”>
· 1 Coulomb
· 1 Newton / 1 Coulomb
· 1 Joule / 1 Coulomb
· 1 Newton / 1 meter
Answer: (c)
1 Joule / 1 Coulomb
Explanation: 1
V = 1 Joule / 1 Coulomb
4. The work done in moving a unit positive test charge over
a closed path in an electric field is _____________.
a. Always
1
b. Infinite
c.
Zero
d. Negative
Answer: (c)
Zero
Explanation: We
say electrostatic forces are conservative in nature since the work done in
moving a unit positive test charge over a closed path in an electric field is
zero. (
5. The electrostatic potential on the perpendicular bisector
due to an electric dipole is _____________.
a. Zero
b. 1
c.
Infinite
d. Negative
Answer: (a)
Zero
Explanation: The
electrostatic potential on the perpendicular bisector due to an electric dipole
is zero.
6. A surface that has the same electrostatic potential at
every point on it is known as _____________.
a. Equal-potential
surface
b. Same
potential surface
c.
Equi-magnitude surface
d. Equipotential
surface
Answer: (d)
Equipotential surface
Explanation: Equipotential
surface is a surface formed by the locus of all the points which are at the
same potential. Equipotential surfaces do not intersect with each other and are
closely spaced in the region of strong electric fields and vice-versa. (
7. The work done against electrostatic force gets stored in
which form of energy?
a. Thermal
energy
b. Kinetic
energy
c.
Potential energy
d. Solar
energy
Answer: (c)
Potential energy
Explanation: The
work done against electrostatic force gets stored in the form of potential
energy.
8. Dielectrics are _____________
a. Conducting
substances
b. Non-conducting
substances
c.
Semi-conducting substances
d. None of
the option
Answer: (b)
Non-conducting substances
Explanation: Dielectrics
are non-conducting substances.
9. The electric potential inside a conducting sphere
_____________
a. is zero
b. increases
from centre to the surface
c.
decreases from centre to the surface
d. remains
constant from centre to the surface
Answer: (d)
remains constant from centre to the surface.
Explanation: The
electric potential inside a conducting sphere remains constant from centre to
the surface.
10. The capacity of the parallel plate capacitor increases
when
a. area of
the plate is decreased
b. area of
the plate is increased
c.
distance between the plates increases
d. None of
the option
Answer: (b)
area of the plate is increased
Explanation: The
capacity of the parallel plate capacitor increases when the area of the plate
is increased.
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