# Electromagnetic Theory | Assertion/Reason Questions

Choose the correct option for the following electromagnetic theory assertion & reason questions.

1. Both P and B are true and B is a correct explanation of P
2. Both P and B are true but B is not a correct explanation of P
3. P is true but B is false
4. P is false but B is true

Q. (P): The electric field around a positive charge is outward.
(B): Gauss law states that the differential of the normal component of the outward electric flux density over a closed surface yields the positive charge enclosed.

Answer
(c)

Q. (P): The static magnetic field has zero divergence and non-zero curl.
(B): The static magnetic field satisfies the flux law.

Answer
(b)

Q. (P): Electric field cannot exist inside a perfect conductor.
(B): For a perfect conductor σ = ∞ and there is no voltage drop inside the conductor.

Answer
(a)

Q. (P): Displacement current can have only ac components.
(B): It is generated by a change in electric flux.

Answer
(a)

Q. (P): When there is no charge in the interior of a conductor the electric field intensity is infinite.
(B): As per Gauss’ s law the total outward electric flux through any closed surface constituted inside the conductor must vanish.

Answer
(d)

Q. (P): Potential everywhere on a conducting surface of infinite extent is zero.
(B): Displacement density on a conducting surface is normal to the surface.

Answer
(b)

Q. (P): When an alternating field is applied to a dielectric, the relative permittivity is a complex quantity.
(B): The imaginary part of the relative permittivity is responsible for dielectric loss.

Answer
(a)

Q. (P): The test charge may have any value while defining electric field intensity.
(B): The test charge should not disturb the field being measured.

Answer
(d)

Q. (P): A capacitor can store charge.
(B): The plates of the condenser are conductive

Answer
(b)

Q. (P): Time varying electric field produces magnetic fields.
(B): Time varying magnetic field produces electric fields.

Answer
(b)

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