Physics Quiz

Which of the following statements is correct?

• Electric field lines extend away from positive charge and toward negative charge.

• Electric field lines extend toward both positive and negative charges.

• Electric field lines extend away from both positive and negative charges.

• Electric field lines extend away from negative charge and toward positive charge.

The inductance of a coil is 4H. If the current changes at the rate of 2 A/s, what is the induced emf in the coil?

• 8V

• 4V

• 2V

• 16V

What is the definition of capacitance?

• The total electric field around a conductor.

• The ability of a system to store charge per unit potential difference.

• The amount of charge a conductor can hold.

• The potential energy of a charged conductor.

What is the role of the inductor in an RL circuit?

• It resists changes in voltage.

• It increases voltage.

• It resists changes in current.

• It reduces power loss.

The electric field due to a dipole at an axial point is proportional to:

• 1/r³

• r

• 1/r

• 1/r²

What is a major disadvantage of Integrated Circuits (ICs) related to component failure?

• The failure of one component does not affect the others.

• The IC can be repaired easily.

• Only the failed component is replaced.

• The whole circuit must be replaced if one component fails.

Which of the following represents the electric potential V due to a point charge q at a distance r?

• V = kq/r²

• V = kq/rε₀

• V = kq/r

• V = q/4πε₀r²

The mathematical expression for Gauss's Law is:

• E ⋅ dA = k/ar²

• E ⋅ dA = q/ε₀

• E = F/q

• ∫ dA = q

What is the flow of electric current in a conductor under the influence of an external electric field primarily due to?

• Atoms

• Electrons

• Neutrons

• Protons

In the saturation (active or pinch-off) region of a JFET, the drain current (ID):

• Decreases as VDS increases.

• Becomes zero.

• Becomes constant and independent of VDS.

• Increases linearly with VDS.