Coulombs Law Quiz | Coulombs Law Objective Type Questions and Answers

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Questions
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

Answer: 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
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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

Answer: 2 kV
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

Answer: A Capacitor
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

Answer: 0.5 mega daraf
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

Answer: 3 mA
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

Answer: Charge
32 Coulomb law is employed in
A Electrostatics
B Magnetostatics
C Electromagnetics
D Maxwell’s law

Answer: Electrostatics
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

Answer: -18 X 106
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

Answer: 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

Answer: 0.3
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

Answer: 0.09
37 The unit of field intensity is
A coulomb
B coulomb/m2
C webber
D newton/coulomb

Answer: 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

Answer: decreases
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