NEET Physics: Electric potential and dipole Practice Questions

Correct answer: B — Joule (J)

The electric dipole moment (p⃗) is defined as the product of charge and distance (p = q × d). Since charge is in Coulombs (C) and distance is in meters (m), the unit is Coulomb-meter (C·m), which is equivalent to Joule/Tesla (J·m/T) or Ampere-meter (A·m).

Correct answer: B — Two equal and opposite charges separated by a small distance

An electric dipole consists of two equal and opposite charges separated by a small distance, creating a net electric dipole moment.

Correct answer: B — kQ/r

The electric potential V due to a point charge Q at a distance r in vacuum is defined as V = kQ/r, where k = 1/(4πε₀).

Correct answer: B — The potential energy of the dipole

The work done done in moving a system between two points is equal to the change in potential energy. Since the initial potential energy was defined relative to a zero field, the work done equals the potential energy of the dipole in the new region.

Correct answer: B — Definition of Electric Potential

Electric field lines are the gradient of the electric potential; field lines always point in the direction of decreasing potential, meaning they originate from higher potential and end at lower potential.

Correct answer: B — It represents the potential energy of the dipole due to its interaction with the external field.

The expression U = -p⃗ · E⃗ represents the potential energy stored in the dipole due to its interaction with the external electric field E⃗.

Correct answer: D — Zero

Electric potential is defined relative to infinity, where the potential is conventionally taken as zero. If the potential at a point is zero, the potential difference between that point and infinity is zero.

Correct answer: A — Joule

Electric potential (Voltage) is defined as energy per unit charge, which is measured in Joules per Coulomb (J/C), and the unit is the Volt (V).

Correct answer: A — Electric potential difference

Electric potential is the work done per unit charge in bringing a test charge from infinity to that point in an electric field. It is a scalar quantity.

Correct answer: B — Electric Potential

Electric Potential (V) is a scalar quantity representing the potential energy per unit charge at a specific point. Electric Field (E) is a vector, Electric Flux is a scalar, and Electric Dipole Moment is a vector.

Correct answer: C — Volt (V)

Electric potential (Voltage) is defined as the work done per unit charge, which is energy per charge. The SI unit for electric potential is the Volt (V), where 1 Volt = 1 Joule/Coulomb.

Correct answer: A — The work done per unit charge in moving a charge between two points

Electric potential (V) at a point is defined as the electric potential energy per unit charge (V = U/q₀), representing the potential energy per unit charge at that location.

Correct answer: D — Attractive force

The interaction between two dipoles depends on their relative orientation. If they are aligned parallel, the force is attractive; if they are aligned antiparallel, the force is repulsive. In a simple context, attractive/repulsive forces are fundamental to dipole interactions.

Correct answer: D — 1/r

The electric field (E⃗) due to a dipole falls off with the inverse cube of the distance (1/r³) when the observation point is far from the dipole, as the field itself is proportional to 1/r³ and the dipole moment is constant.