Electricity & Magnetism MCQs with Answers

If the distance between two charges is reduced to half, then the Coulomb's force would become ?

• A.Two times
• B.Four times
• C.Half
• D.One-fourth

The magnetic effect of electric current is used in which of the following devices?

• A.Electric bells and motors
• B.Electric heater and iron
• C.LED bulbs and fluorescent tubes
• D.Solar cells and thermocouples

The presence of a magnetic field can be detected by _?

• A.Magnetic compass
• B.Thermometer
• C.Barometer
• D.Hygrometer

The ratio of output voltage to input voltage in a transistor is called _?

• A.Voltage gain of the amplifier
• B.Current gain of the amplifier
• C.Power gain of the amplifier
• D.Resistance gain of the amplifier

The current through an inductance follows ?

• A.Logarithmic growth
• B.Linear growth
• C.Sinusoidal growth
• D.Exponential growth

A hollow metal sphere is charged to a potential V. The potential at its center is _?

• A.Zero
• B.V
• C.V/2
• D.2V

In electrical cables, AWG stands for _?

• A.Aluminum Wire Gauge
• B.Alternating Wire Grid
• C.Ampere Wire Grade
• D.American Wire Gauge

The condition when the resistance of a circuit is zero is known as?

• A.Open circuit
• B.Short circuit
• C.Closed circuit
• D.Broken circuit

The splitting of spectral lines in a magnetic field is called:

• A.Stark effect
• B.Zeeman effect
• C.Doppler effect
• D.Photoelectric effect

The microscopic form of Ohm's law is ?

• A.R = ρL/A
• B.V = IR
• C.P = VI
• D.J = σE