# Electromagnetic Theory | True-False Questions

Q. Coulomb’s law for the force between electric charges most closely resembles with Newton’s law of gravitation.

True

Q. Dielectric constant and permittivity are same.

True

Q. Potential of every point inside a hollow charged sphere is same.

True

Q. In electrostatic field A x E = 0.

True

Q. The charge in a capacitor is stored in dielectric field.

True

Q. A capacitor is sort of open circuit to dc.

True

Q. The current through a capacitor is zero if the voltage across it is not changing with time.

True

Q. The capacitor never dissipates energy but only stores it.

True

Q. The unit of polarization is same as that of electric field density.

True

Q. Electric field line and equipotential line are never orthogonal.

False

Q. The charge on an isolated conductor resides inside the conductor.

False

Q. The operator ‘del’ (∇) is a scalar space function.

False

Q. Electrostatic field is solenoidal.

False

Q. Tangential component of the electric field on a perfect conductor will be infinite.

False

Q. In free space, if ρ = 0, the Poisson’s equation becomes Laplacian equation ∇2∇ = 0.

True

Q. Laplace’s equation is nonlinear but Poisson’s equation is linear.

False

Q. The polarity of a solenoid can be determined by Corkscrew rule.

False

Q. The Biot Savart’s law is a general modification of Ampere law.

True

Q. An electromagnetic field is said to be conservative when divergence of the field is zero.

False

Q. MMF is analogous to electromotive force.