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Free download in PDF Coulombs Law Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, NEET, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
(21)
If a unit charge is taken from one point to another over an equipotential surface, then
[A]
work is done on the charge
[B]
work is done by the charge
[C]
work on the charge is constant
[D]
no work is done
(22)
The electric field intensity on the surface of a charged conductor is
[A]
zero
[B]
directed normally to the surface
[C]
directed tangentially to the surface
[D]
directed along 45° to the surface
Answer: directed normally to the surface
(23)
A capacitor having a capacitance of 30 μf is connected across a 200 V dc source. The charging current will be least
[A]
initially
[B]
when capacitor is half charged
[C]
when capacitor is fully charged
[D]
when capacitor is almost 90% charged
Answer: when capacitor is half charged
(24)
A sphere of 1 meter radius can attain a maximum potential of
[A]
1000 V
[B]
2 kV
[C]
30 kV
[D]
3×106 V
(25)
A capacitor is charged and source is then disconnected. When the plates are now separated
[A]
charge changes
[B]
charge and potential difference both change
[C]
charge and potential difference remain constant
[D]
All Of The Above
Answer: charge and potential difference both change
(26)
The current in a single element circuit leads the voltage 65° at all time. The circuit element is
[A]
A Resistor
[B]
An Inductor
[C]
A Capacitor
[D]
Any Of The Above
(27)
The charge on a capacitor is 1.5×10-2 coulombs when the potential difference across its plates is 750 V. The elastance of the capacitor will be
[A]
0.5 mega daraf
[B]
1 mega daraf
[C]
11.2 mega daraf
[D]
None of the above
(28)
The capacitance between two plates increases with
[A]
larger plate area and shorter distance between plates
[B]
shorter plate area and shorter distance between them
[C]
shorter plate area and higher applied voltage
[D]
larger plate area, longer distance between plates and higher applied voltage
Answer: larger plate area and shorter distance between plates
(29)
For a capacitance of 10 μf the potential difference is increased uniformly from 0 to 600 V in 2 seconds. The charging current must be
[A]
1 mA
[B]
3 mA
[C]
5 mA
[D]
All the above
(30)
For dielectrics, flux is proportional to
[A]
potential difference between electrodes
[B]
resistivity of medium
[C]
rate of change of potential difference
[D]
None Of The Above
Answer: potential difference between electrodes
31
Coulomb is the unit of which quantity?
[A]
Field strength
[B]
Charge
[C]
Permittivity
[D]
Force
32
Coulomb law is employed in
[A]
Electrostatics
[B]
Magnetostatics
[C]
Electromagnetics
[D]
Maxwell’s law
33
Find the force between 2C and -1C separated by a distance 1m in air(in newton).
[A]
18 X 106
[B]
-18 X 106
[C]
18 X 10-6
[D]
-18 X 10-6
34
Find the force of interaction between 60 stat coulomb and 37.5 stat coulomb spaced 7.5cm apart in transformer oil(εr=2.2) in 10-4 N,
[A]
8.15
[B]
5.18
[C]
1.518
[D]
1.815
35
Two small diameter 10gm dielectric balls can slide freely on a vertical channel. Each carry a negative charge of 1μC. Find the separation between the balls if the lower ball is restrained from moving.
[A]
0.5
[B]
0.4
[C]
0.3
[D]
0.2
36
A charge of 2 X 10-7 C is acted upon by a force of 0.1N. Determine the distance to the other charge of 4.5 X 10-7 C, both the charges are in vacuum.
[A]
0.03
[B]
0.05
[C]
0.09
[D]
All of the above
37
The unit of field intensity is
[A]
coulomb
[B]
coulomb/m2
[C]
webber
[D]
newton/coulomb
38
Coulomb’s law for the force between electric charges most closely resembles with
[A]
newton law of motion
[B]
law of conversation of energy
[C]
Gauss theorem
[D]
newton law of gravitation
Answer: law of conversation of energy
39
Another name for relative permittivity is
[A]
dielectric constant
[B]
dielectric strength
[C]
potential gradient
[D]
none of the above
Answer: dielectric constant
40
When the relative permittivity of the medium is increased, the force between two charges placed at a given distance apart
[A]
increases
[B]
decreases
[C]
remains the same
[D]
none of the above
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