Capacitive reactance Xc is:

• A) 1/2πfC
• B) 4πfC
• C) 1/4πfC
• D) 2πfC

What does Gauss's law for magnetism state regarding the net magnetic flux through a closed surface?

• A) The net magnetic flux is zero.
• B) The net magnetic flux depends on the size of the closed surface.
• C) The net magnetic flux is always positive.
• D) The net magnetic flux is always negative.

Which of the following is equivalent to one coulomb?

• A) one volt per ampere
• B) One volt ampere
• C) one ampere per volt
• D) One ampere second

Which of the following is usually taken to make the core of a transformer?

• A) Aluminum
• B) Hard iron
• C) Copper
• D) Soft iron

When the angle θ is 60°, how does the magnetic flux compare to its maximum value?

• A) Magnetic flux is maximized.
• B) Magnetic flux is unchanged.
• C) Magnetic flux is half of the maximum.
• D) Magnetic flux is zero.

What is a Gaussian surface in the context of Gauss's Law?

• A) A surface with constant electric field
• B) Any closed surface in space
• C) An imaginary surface used to apply Gauss's Law
• D) A surface with nonzero electric flux

What principle governs the conversion of magnetic variations into an electric current in magnetic recording tapes?

• A) Ampere's Law
• B) Coulomb's Law
• C) Faraday's Law
• D) Ohm's Law

Which of the following is equivalent to 1 V?

• A) 1 J/W
• B) 1 J/s
• C) 1 J/C
• D) 1 J/A

The graphical representation of Ohm’s law is:

• A) Parabola
• B) Hyperbola
• C) Ellipse
• D) Straight line

Under what condition is induced electromotive force (EMF) produced in a conductor?

• A) When there is a constant magnetic field
• B) When there is a strong magnetic field
• C) When there is a strong electric field
• D) When there is a time-varying magnetic field

Phase difference between V and I of an A.C through resistor is:

• A) 270 degree
• B) 180 degree
• C) 0 degree
• D) 90 degree

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