Electricity & Magnetism MCQs with Answers

Lenz' Law can explain _?

• A.Paramagnetism only
• B.Diamagnetism only
• C.Both paramagnetism and diamagnetism
• D.Ferromagnetism only

Magnetic vector potential is a vector _?

• A.Whose curl is equal to the magnetic flux density
• B.Whose divergence is equal to the magnetic flux density
• C.Whose gradient is equal to the magnetic flux density
• D.That is always parallel to the magnetic field

The term "RC" has same unit as that of _?

• A.Velocity
• B.Frequency
• C.Time
• D.Resistance

Which is the path through which electric current passes?

• A.Electric insulator
• B.Electric field
• C.Electric conductor
• D.Electric circuit

Which of the following is not a magnetic material?

• A.Iron
• B.Cobalt
• C.Aluminum
• D.Nickel

An electron is moving along the positive x-axis in a magnetic field that lies in the xz-plane. The magnetic force on the electron will be along the ?

• A.y-axis
• B.x-axis
• C.z-axis
• D.negative y-axis

What is the direction of the magnetic field lines inside a bar magnet?

• A.North pole to south pole
• B.South pole to north pole
• C.From the center outward
• D.They do not exist inside the magnet

During negative half cycle of AC, PN junction offers?

• A.High resistance
• B.Low resistance
• C.Zero resistance
• D.Infinite resistance

The electrical conductivity of a semiconductor?

• A.Remains constant with change in temperature
• B.Decreases with increase in temperature
• C.Increases with increase in temperature
• D.First increases then decreases with increase in temperature

The direction of electric force and electric field intensity is ?

• A.Parallel to each other
• B.Perpendicular to each other
• C.Opposite to each other
• D.None of these