electrostatics MCQs – Page 6

Practise focused electrostatics questions with marked answers for exam preparation and subject revision.

electrostatics Mcqs
101. at a point is equal to the negative potential gradient at that point?
comments icon0

A. Electric flux

B. Magnetic flux density

C. Magnetic flux

D. Electric intensity
102. Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be______________?
comments icon0

A. positively and negatively charged

B. negatively charged

C. electrically neutral

D. positively charged

103. The potential gradient across the material of low permittivity is than across the material of high permittivity?
comments icon0

A. smaller

B. greater

C. both (A) and (B)

D. none of the above

104. If two charges are increased by two times then force_____________?
comments icon0
A. Increases 4 times

B. Increases 9 times

C. Decreases 9 times

D. Decreases 4 times

105. Which of the following material has least value of dielectric constant ?
comments icon0

A. Ceramics

B. Glass

C. Oil

D. Paper

106. Which of the following statement is true __________?
comments icon0
A. The current in the dicharging capacitor grows exponentially

B. The current in the discharging capacitor grows linearly

C. The current in the discharging capacitor decays exponentially

D. The current in the discharging capacitor decreases constantly

107. Which of the following capacitors will have the least value of breakdown voltage________ ?
comments icon0

A. Ceramic

B. Electrolytic

C. Paper

D. Mica

108. A unit tube of flux is known as tube___________?
comments icon0

A. Newton

B. Faraday

C. Michale

D. None of the above

109. SI unit of the permittivity of free space is________________?
comments icon0

A. N-1mC-2

B. Nm2C2

C. NmC-1

D. N-1m-2C2
110. The force between two charges is 120 N. If the distance between the charges is doubled, the force will be________________?
comments icon0

A. 60 N

B. 30 N

C. 15 N

D. 40 N

111. An electric charge at rest produces_______________?
comments icon0

A. only a magnetic field

B. only an electric field

C. neither electric field nor magnetic field

D. both electric and magnetic fields

112. A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is___________?
comments icon0
A. 100 kV/m

B. 10 kV/m

C. 2 kV/m

D. 5 kV/m

113. If an electrons is allowed to move along the field in a non uniform electric field then it will follow__________________?
comments icon0
A. Straight line

B. Curved path

C. Circular path

D. Spiral path

114. Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them_____________?
comments icon0

A. all in series

B. two in series and third in parallel across this combination

C. all in parallel

D. two in parallel and third in series with this combination
115. The force per unit charge is know as__________________?
comments icon0
A. electric intensity

B. electric flux

C. electric potential

D. all of above are same

116. Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
comments icon0

A. 1/4th of its original value

B. 4 times of its original value

C. 1/8th of its original value

D. 8 times of its original value

117. Which medium has the least dielectric strength ____________?
comments icon0
A. Air

B. Quartz

C. Paraffin wax

D. Glass

118. The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed. The above statement is associated with____________?
comments icon0

A. Coulombs square law

B. Gausss law

C. Maxwells first law

D. Maxwells second law

119. Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will_______________?
comments icon0
A. decrease

B. increase

C. remain constant

D. depends upon composition of dielectric

120. Which of the following statements is correct ?
comments icon0

A. Ceramic capacitors must be connected in correct polarity

B. Electrolytic capacitors must be connected in correct polarity

C. Air capapitors have a black band to indicate the outside foil

D. Mica capacitors are available in capacitance values of 5 to 20 uF