If an electron of charge is accelerated through a potential difference V, it will acquire energy

• A) E/2
• B) 2V
• C) V/2
• D) Ve

If the area of the plates increase by 6 times, and the distance between plates is reduced to half, the capacitance will be

• A) decreased by 12 times
• B) increased by 12 times
• C) decreased by 3 times
• D) increased by 3 times

The ability of a capacitor to store charge depends upon

• A) type of dielectric used
• B) all of these
• C) area of plates
• D) distance between plates

A detector is used to detect the speed of a particular wave. If the frequency of an electromagnetic signal is 400 MHz, the speed detected by detector is __________.

• A) 300000 km/s
• B) 300000 m/h
• C) 300000 mm/s
• D) 300000 m/min

Coulomb's law is only true for point charges whose sizes are

• A) very small
• B) large
• C) very large
• D) medium

What is the unit of self-inductance?

• A) Weber (Wb)
• B) Gauss (G)
• C) Henry (H)
• D) Tesla (T)

1 Tesla is equal to

• A) 103 guass
• B) 10-3 guass
• C) 104 guass
• D) 10-4 guass

In a series circuit with capacitors C1​ and C2​, if C1​ is much larger than C2​, what is the approximate total capacitance (CT​)?

• A) CT​ ≈ C2
• B) CT ≈ C1 ​⋅ C2​
• C) CT​ ≈ C1​
• D) CT ​≈ C1 ​+ C2​

Which of the following is the expression for Lorentz force?

• A) F = qE + q (v x B)
• B) F = ma + qE
• C) F = q (v x B)
• D) F = qE

In a dielectric material, what causes the separation of negative and positive charges on each molecule?

• A) Dissipation
• B) Ionization
• C) Conduction
• D) Polarization

The sum of electric and magnetic force is called.

• A) Newton’s force
• B) Lorentz force
• C) Centripetal force
• D) Maxwell force

Two parallel straight wires carrying current in same direction will:

• A) Repel each other
• B) Attract each other
• C) May repel or attract
• D) No effect

A charged particle oscillates about its mean position with a frequency of 109 Hz. The frequency of electromagnetic waves produced by the oscillator is:

• A) 109 Hz
• B) 106 Hz
• C) 107 Hz
• D) 108 Hz

A battery has an EMF of 10 volts and an internal resistance of 1 Ω. If the battery is connected to a load of 4 Ω, what is the current flowing through the circuit?

• A) 2.5 A
• B) 3 A
• C) 10 A
• D) 2 A

What property of ions determines the extent of deflection in a magnetic field in a mass spectrometer?

• A) Ion charge
• B) Ion energy
• C) Ion size
• D) Ion-mass to charge ratio (m/q)

Which one of the following voltages is obtained from a generator?

• A) DC voltage
• B) AC voltage
• C) Either AC or DC voltage
• D) Neither AC nor DC voltage

If the current through the conductor is doubled while the radius of the circular loop remains constant, what happens to the magnetic field according to Ampère's law?

• A) Magnetic field remains the same.
• B) Magnetic field doubles.
• C) Magnetic field quadruples.
• D) Magnetic field is halved.

What is the electric field direction at a point on the axial line of an electric dipole?

• A) Toward the negative charge
• B) Opposite to the dipole moment direction
• C) Along the line from negative to positive
• D) Toward the positive charge

Which of the following statements is NOT TRUE about electromagnetic waves?

• A) The electromagnetic radiation from a burning candle is un-polarized.
• B) The receptions of electromagnetic waves require an antenna.
• C) Electromagnetic waves satisfy the Maxwell's Equation.
• D) Electromagnetic waves can not travel through space.

A stationary charge placed in a magnetic field will experience:

• A) No force.
• B) A magnetic force.
• C) An electric force.
• D) Both electric and magnetic forces.