# Electrostatics MCQ

Below Electrostatics quiz are Multiple Choice Questions (MCQs) type Quiz. These Electrostatics MCQ Questions helps you to refresh your Electrostatics, you can see the correct option by clicking on it. .
• ### 1. In equation Q=CV, C is constant of proportionality called capacitor's

• power
• heat
• capacitance
• electric intensity
• ### 2. If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that

• friction destroyed electrons in the rod.
• the silk has become negatively charged.
• protons have moved to the rod.
• glass attracts more protons.
• ### 3. 3 capacitors with capacitances 5µF, 6µF and 7µF are arranged in series combination with a battery of 5V, as 1µF = 10-6F, the voltage across each capacitor is

• 1.96V, 1.63V, 1.4V
• 2.1V, 2.5V, 2.8V
• 0.5V, 0.9V, 0.8V
• 3.6V, 3.8V, 3.9V
• ### 4. During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ...

• the plastic strip acquired extra protons from the cotton.
• the plastic strip acquired extra protons from the charging process
• protons were created as the result of the charging process
• the plastic strip lost electrons to the cotton during the charging process
• ### 5. An electrostatic force of magnitude F exists between two metal spheres having identical charge q. The distance between their centers is r. Which combination of changes would produce no change in the electrostatic force between the spheres?

• doubling q on both spheres while halving r
• doubling q on one sphere while halving r
• doubling q on one sphere while doubling r
• doubling q on both spheres while doubling r

• Conduction
• Convection
• Friction
• Induction
• ### 7. The ability of a capacitor to store charge depends upon

• area of plates
• distance between plates
• type of dielectric used
• all of above
• ### 8. In electrostatic air cleaner, air mixed with dust and pollen enters device across

• positively charged mesh
• negatively charged mesh
• neutral mesh
• dual charged mesh

• Friction
• Conduction
• Grounding
• Induction

• medium
• very large
• very small
• large

• 2 N/C
• 20 N/C
• 80 N/C
• 42 N/C

• 2.0N
• 4.0N
• 8.0N
• 1.0N
• ### 13. In a good insulator, electrons are usually

• free to move around
• free to move around after an impurity has been added
• semi-free to move around
• tightly bound in place
• ### 14. Three charged metal spheres, X, Y, and Z, are on insulating stands. All three spheres are simultaneously brought into contact with each other and then returned to their original positions. Which statement best describes the charge of the spheres after this procedure is completed?

• All the spheres will end up with the same charge
• All the spheres are neutral
• Sphere Y has a greater charge than spheres X or Z
• Each sphere retains the same charge that it had originally
• ### 15. The ability of a capacitor to store charge is affected by

• area of the plates
• distance between the plates
• type of insulators used
• all of above
• ### 16. Insulators are different than conductors in that insulators ____.

• do not contain electrons or protons
•  do not contain any charge
• have a weaker affinity for electrons
• do not allow charge to freely move
• ### 17. Only the __ move to create unbalanced charges.

• Neutrons
• Protons
• Electrons
• Static Electricity
• ### 18. A negatively charged plastic comb is brought close to, but does not touch, a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper

• must be positive
• must be negative
• may be neutral or negative
• may be neutral or positive
• ### 19. Metal sphere A has a charge of +12 elementary charges and identical sphere B has a charge of +16 elementary charges. After the two spheres are brought into contact and separated, the charge on sphere A is

• +14 elementary charges
• +28 elementary charges
• +2 elementary charges
• -2 elementary charges
• ### 20. Neutral atoms contain equal numbers of positive __ and negative __.

• Electrons and Protons
• Protons and Electrons
• Neutrons and Electrons
• Protons and Neutrons
• ### 21. Which net charge could be found on an object?

• 4.8 x 10-19 C
• 1.8 x 10-19 C
• 3.0 x 10-19 C
• 2.8 x 10-19 C

• zero
• positive
• negative
• dual

• 800 uC
• 900 uC
• 1200 uC
• 1600 uC
• ### 24. Dielectric strength of mica is

• 10 to 20 kV/mm
• 30 to 50 kV/mm
• 50 to 200 kV/mm
• 300 to 500 kV/mm
• ### 25. Calculate the force exerted between two charged objects separated by a distance of 0.6 m. One object has a charge of -5 C and the other has a charge of +2.0 C.

• 1.5E-11 N attracted
• 2.5E-11 N repelled
• 2.5E11 N attracted
• 7.5E-10 N attracted

• 0.2 N
• 0.5 N
• 2 N
• 10 N

• E = F - qo
• E = F/qo
• E = F + qo
• E = qo/F

• ### 29. Compared to insulators, metals are better conductors of electricity because metals contain more free

• protons
• electrons
• positive ions
• negative ions

• C-1
• J-1
• JC-1
• JC-4

• Newton(N)
• coulomb(C)
• Pascal(Pa)

• C-1
• N-1
• NC-1
• NC-4

• volts
• ohm
• coulomb
• newton
• ### 34. Electroscope can be charged by

• convection
• conduction
• all of above
• ### 35. Plastic rod rubbed with fur and glass rod rubbed with silk

• repel each other
• mix up with each other
• attract each other
• none of above

• Glass
• Vacuum
• Ceramics
• Oil
• ### 37. Dielectric strength of medium

• increases with rise in temperature
• increases with moisture content
• is same for all insulating materials
• none of the above

• 0.0002
• 0.002
• 0.02
• 0.2
• ### 39. In a capacitive circuit

• a steady value of applied voltage causes discharge
• an increase in applied voltage makes a capacitor charge
• decrease in applied voltage makes a capacitor charge
• none of the above
• ### 40. Dielectric strength of a material depends on

• moisture content
• temperature
• thickness
• all of the above
• ### 41. The power dissipated in a pure capacitor is

• zero
• proportional to applied voltage
• proportional to value of capacitance
• both (B) and (C) above
• ### 42. Good insulators

• have electrons free to move around
• have tightly bound electrons
• have electrons do not move at all
• All of above

• Newton
• Ohm
• Joule
• Coulomb
• ### 44. Opposite charges

• attract each other.
• repel each other.
• ### 45. Which particle has a negative charge?

• Protons
• Neutrons
• Electrons
• All of above
• ### 46. What charge does a proton have?

• negative (-)
• positive (+)
• neutral or no charge (0)
• All of above
• ### 47. Two like charges

•  neutralize each other.
• repel each other.
• must be neutrons.
• attract each other.

• F
• q
• d
• D

• F
• f
• N
• n

• Feet
• Meters
• Coulombs
• Newtons