Electricity & Magnetism MCQs with Answers

If the distance between two point charges is doubled, the force between them will become _?

• A.1/2
• B.1/4
• C.1/8
• D.2 times

Which one of the following is NOT a feature of electric forces?

• A.They act on masses
• B.They can be attractive or repulsive
• C.They act on charges
• D.They follow inverse square law

Resistance of super conductor is?

• A.Infinite
• B.Zero
• C.Very high
• D.Depends on temperature

The presence of a dielectric between the plates of capacitors, the capacitance of capacitor ?

• A.Increases
• B.Decreases
• C.Remains the same
• D.First increases then decreases

A common method of protection is to use a in the lighting circuit.

• A.Fuse
• B.Switch
• C.Resistor
• D.Capacitor

Energy density in case of a capacitor is always proportional to _?

• A.E (Electric field intensity)
• B.E² (Square of electric field intensity)
• C.1/E (Reciprocal of electric field intensity)
• D.√E (Square root of electric field intensity)

The product of volt and ampere gives _?

• A.Watt
• B.Joule
• C.Ohm
• D.Coulomb

The conduction in an SCR is controlled by ?

• A.Base
• B.Anode
• C.Cathode
• D.Gate

Force on a moving charge in a uniform magnetic field depends upon?

• A.Magnitude of charge
• B.Velocity of the charge
• C.Strength of magnetic field
• D.All of these

A current of 1A is flowing along positive x-axis through a straight wire of length 0.5m placed in a region of a magnetic field given by B = (2i + 4j)T. The magnitude and the direction of the force experienced by the wire respectively are ?

• A.2N, along positive z-axis
• B.2N, along negative z-axis
• C.1N, along positive z-axis
• D.1N, along negative z-axis