Average value of current and voltage over complete cycle is:

• A) Negative
• B) Zero
• C) Infinite
• D) Positive

Charge carriers in electrolysis are:

• A) Electrons
• B) Protons
• C) Holes
• D) Positive and negative ions

Which of the following statements is false about the properties of electromagnetic waves?

• A) The energy of the electromagnetic wave is divided equally between electric and magnetic fields.
• B) Both electric and magnetic field vectors attain their maximum and minimum at the same place and at the same time.
• C) These waves do not require any material medium for propagation.
• D) Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.

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

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

If the cross-sectional area A of a conductor is increased while keeping the current I constant, what happens to the current density J?

• A) J becomes negative.
• B) J increases
• C) J remains unchanged.
• D) J decreases.

How does the radius of the ion's path in the magnetic field change as the mass of the ion increases? (Provided all other parameters are kept constant).

• A) The radius increases.
• B) The radius remains constant.
• C) The change in mass does not affect the radius.
• D) The radius decreases.

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

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

Electric field due to oppositely charged parallel plate capacitor is

• A) σ/εo
• B) σ/2εo
• C) ϕ/εo
• D) ϕ/2εo

Energy density in case of a capacitor is always proportional to:

• A) CV
• B) E 2
• C) V 2
• D) C 2

The relation between electric filed due to infinite sheet of charge (Es) to oppositely charged parallel plate capacitor of infinite length (Ec) is

• A) Es = 4Ep
• B) Ec = 2Es
• C) Es = Ep
• D) Es = 2Ep

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

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

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