Electrostatics MCQs

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The ohmmeter reading for a shorted capacitor is

  • A. infinity
  • B. few kilo ohms
  • C. few mega ohms
  • D. zero
  • Correct Answer: Option D

Internal heating of a capacitor is usually attributed to

  • A. leakage resistance
  • B. electron movement
  • C. plate vibration
  • D. dielectric charge
  • Correct Answer: Option A

In a capacitor, the electric charge is stored in

  • A. metal plates
  • B. dielectric
  • C. dielectric as well as metal plates
  • D. neither dielectric nor metal plates
  • Correct Answer: Option B

A circuit component that opposes the change in the circuit voltage is

  • A. resistance
  • B. inductance
  • C. capacitance
  • D. none of these
  • Correct Answer: Option C

A capacitance C is changed through a resistance R. The time constant of the charging circuit is given by

  • A. RC
  • B. 1/RC
  • C. C/R
  • D. R/C
  • Correct Answer: Option A

If the medium of a parallel-plate capacitor consists of mica and air, the capacitance is increases by

  • A. increasing the air space
  • B. increasing the area of the plates
  • C. decreasing the area of the plates
  • D. increasing the thickness of mica
  • Correct Answer: Option B

If a dielectric is placed in a electric field, the field strength

  • A. decreases
  • B. increases
  • C. remains the same
  • D. becomes zero
  • Correct Answer: Option A

One farad is

  • A. coulomb-joule
  • B. one coulomb per volt
  • C. joule per volt
  • D. one volt per coulomb
  • Correct Answer: Option B

The power dissipated in a pure capacitor is

  • A. maximum
  • B. minimum
  • C. zero
  • D. depends on the size and voltage
  • Correct Answer: Option C

A sphere of one meter radius can attain a maximum potential of

  • A. 1000 V
  • B. 3 million volts
  • C. 30 kV
  • D. 3 kV
  • Correct Answer: Option D