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- a) A1 and A2
- b) B1 and B2
- c) Both directions
- d) No stable
Ans: b
2. Which charge configuration produces a uniform electric
field?
- a) point charge
- b) infinite uniform line charge
- c) uniformly charged infinite plane
- d) uniformly charged spherical shell
Ans: C
3. What is the ratio of the charges | 𝑞1 / 𝑞2 | for the following electric field
line pattern?
- a) 1 / 5
- b) 25 / 11
- c) 5
- d) 11 / 25
Ans: d
4. An electric dipole is placed at an alignment angle of 30°
with an electric field of 2×105 𝑁 𝐶-1.
It experiences a torque equal to 8 N m. The charge on the dipole if the
dipole length is 1 cm is
- a) 4 mC
- b) 8 mC
- c) 5mC
- d) 7 mC
Ans: b
5. Four Gaussian surfaces are given below with charges
inside each Gaussian surface. Rank the electric flux through each Gaussian
surface in increasing order.
- a) 𝐷 < 𝐶 < 𝐵 < 𝐴
- b) 𝐴 < 𝐵 = 𝐶 < 𝐷
- c) 𝐶 < 𝐴 = 𝐵 < 𝐷
- d) 𝐷 > 𝐶 > 𝐵 > 𝐴
Ans: a
6. The total electric flux for the following closed surface
which is kept inside water _____
Ans: b
7. Two identical conducting balls having positive charges q1
and q2 are separated by a center to center distance r. If they are made to
touch each other and then separated to the same distance, the force between
them will be
- a) less than before
- b) same as before
- c) more than before
- d) zero
Ans: C
8. Rank the electrostatic potential energies for the given system of charges in increasing order
- a) 1=4<2<3
- b) 2=4<3<1
- c) 2=3<1<4
- d) 3<1<2<4
Ans: a
9. An electric field 𝐸 = 10 𝑥 𝑖 exists in a certain region of
space. Then the potential difference V = VO – VA,
where VO is the potential at the origin and VA is the
potential at x = 2 m is:
- a) 10 V
- b) - 20V
- c) + 20 V
- d) - 10 V
Ans: b
10. A thin conducting spherical shell of radius R has a
charge Q which is uniformly distributed on its surface. The correct plot for
electrostatic potential due to this spherical shell is
Ans: b
11. Two points A and B are maintained at a potential of 7 V
and -4 V respectively. The work done in moving 50 electrons from A
to B is
- a) 8.80 × 10−17𝐽
- b) −8.80 × 10−17𝐽
- c) 4.40 × 10−17𝐽
- d) 5.80 × 10−17𝐽
Ans: a
12. If voltage applied on a capacitor is increased from V to
2V, choose the correct conclusion.
- a) Q remains the same, C is doubled
- b) Q is doubled, C doubled
- c) C remains same, Q doubled
- d) Both Q and C remain same
Ans: c
13. A parallel plate capacitor stores a
charge Q at a voltage V. Suppose the area of the parallel plate capacitor and
the distance between the plates are each doubled then which is the quantity
that will change?
- a) Capacitance
- b) Charge
- c) Voltage
- d) Energy
density
Ans: d
14. Three capacitors are connected in
triangle as shown in the figure. The equivalent capacitance between the points
A & C is
- a) 1 𝜇𝐹
- b) 2 𝜇𝐹
- c) 3 𝜇𝐹
- d) 1/4 𝜇𝐹
Ans: a
15. Two metallic spheres of
radii 1 cm and 3 cm are given charges of −1 × 10−2
𝐶 and 5 × 10−2 𝐶 respectively. If these are connected by a conducting wire, the
final charge on the bigger sphere is
- a) 3 × 10−2 𝐶
- b) 4 × 10−2 𝐶
- c) 1 × 10−2 𝐶
- d) 2 × 10−2 𝐶
Ans: a
