A capacitor in an LC oscillator has a maximum potential difference of 15V and a maximum energy of 360 μJ. At a certain instant the energy in the capacitor is 40 μJ. At that instant what is the emf induced in the inductor?

• A) 5V
• B) zero
• C) 15V
• D) 10V

Which of the following is the expression for Lorentz force?

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

What fundamental principle does Kirchhoff's Current Law (KCL) rely on?

• A) Conservation of energy
• B) Conservation of momentum
• C) Conservation of charge
• D) Conservation of power

What does the electric potential due to a dipole depend on?

• A) Magnitude of charges in the dipole
• B) Both distance and angle
• C) Angle between the dipole moment and the field point
• D) Distance from the center of the dipole

An inductor may store energy in its:

• A) Electric field
• B) Gravitational field
• C) Magnetic field
• D) Potential field

If a charged particle moves in a magnetic field, what effect does the magnetic force have on the kinetic energy of the particle?

• A) It increases the kinetic energy.
• B) It decreases the kinetic energy.
• C) It stops the particle.
• D) It does not change the kinetic energy.

If magnetic field is doubled then magnetic energy density becomes:

• A) Three times
• B) Six times
• C) Two times
• D) Four times

What is the primary principle behind a velocity selector in the context of the Lorentz force?

• A) Eliminating the Lorentz force
• B) Minimizing the electric field
• C) Balancing electric and magnetic forces
• D) Maximizing the magnetic force

Electromagnetic waves do not transport:

• A) Charge
• B) Momentum
• C) Information
• D) Energy

Radio waves and light waves are __________.

• A) Electromagnetic and transverse both
• B) Transverse waves
• C) Electromagnetic and longitudinal both
• D) Longitudinal waves

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

• A) 2V
• B) V/2
• C) E/2
• D) Ve

Force per unit charge is:

• A) Electric field intensity
• B) Lorentz force
• C) Electric potential
• D) Electric Flux

Electromagnetic waves are transverse in nature, as evident by the phenomenon of ______.

• A) Polarization
• B) Interference
• C) Reflection
• D) Diffraction

What is the direction of the area vector for a flat surface in the context of magnetic flux?

• A) Perpendicular to the surface
• B) Directed randomly
• C) Parallel to the surface
• D) Tangential to the surface

If velocity of a conductor moving through a magnetic field B is made zero then motional emf is:

• A) -v/LB
• B) Zero
• C) -BL/v
• D) -vBL

Work done on a charged particle moving in uniform magnetic field is:

• A) Negative
• B) Zero
• C) Minimum
• D) Maximum

In the context of capacitors, how is energy related to the electric field strength?

• A) Energy is inversely proportional to the electric field strength
• B) Energy is proportional to the square of the electric field strength
• C) Energy is unrelated to the electric field strength
• D) Energy is directly proportional to the electric field strength

A stationary charge placed in a magnetic field will experience:

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

What is the relationship between the electric field and charges on a perfect electric conductor's surface?

• A) Electric field is normal to the surface and proportional to charge density
• B) Electric field is proportional to charge density
• C) Electric field is discontinuous and inversely proportional to charge density
• D) Electric field is always zero

If a conductor is placed between the plates of a capacitor, what will happen to the potential difference between the plates?

• A) It will be maintained
• B) It will increase
• C) It will decrease
• D) It will become zero