Top 250+ Solved Electromagnetic Theory MCQ Questions Answer
Q. The force between two charges is 120 N. If the distance between the charges is doubled,the force will be
a. 60 N
b. 30 N
c. 40 N
d. 15 N
Q. The electric field intensity at a point situated 4 metres from a point charge is 200 N/C. Ifthe distance is reduced to 2 metres, the field intensity will be
a. 400 N/C
b. 600 N/C
c. 800 N/C
d. 1200 N/C
Q. The ability of charged bodies to exert force on 6ne another is attributed to the existenceof
a. electrons
b. protons
c. neutrons
d. electric field
Q. If the sheet of a bakelite is inserted between the plates of an air capacitor, thecapacitance will
a. decrease
b. increase
c. remains unchanged
d. become zero
Q. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is
a. 0.024 F
b. 0.12 F
c. 0.6 F
d. 0.8 F
Q. For making a capacitor, it is better to select a dielectric having
a. low permittivity
b. high permittivity
c. permittivity same as that of air
d. permittivity slightly more than that of air
Q. If three 15 uF capacitors are connected in series, the net capacitance is
a. 5 uF
b. 30 uF
c. 45 uF
d. 50 uF
Q. If three 10 uF capacitors are connected in parallel, the net cararitance is
a. 20 uF
b. 30 uE
c. 40 uF
d. 50 uF
Q. An electrolytic capacitor can be used for
a. D.C. only
b. AC. only
c. both D.C. as well as A.C.
d. none
Q. The capacitance of a capacitor is not affected by
a. distance between plates
b. area of plates
c. thickness of plates
d. all of the above
Q. Which of the following is not a vector ?
a. Linear momentum
b. Angular momentum
c. Electric field
d. Electric potential
Q. Two plates of a parallel plate capacitor after being charged from a constant voltagesource are separated apart by means of insulated handles, then the
a. Voltage across the plates increases
b. voltage across the plates decreases
c. charge on the capacitor decreases
d. charge on the capacitor increases
Q. If A.C. voltage is applied to capacitive circuit, the alternating current can flow in thecircuit because
a. varying voltage produces the charg¬ing and dicharging currents
b. of high peak value
c. charging current can flow
d. discharge current can flow