What is the expression for Maxwell's equation in free space?

In perfect conductors, the phase shift between the electric field and magnetic field is

Consider a conducting sphere of radius R that has a charge Q. Within what radius is 25% of its energy stored?

A direct on-line starter is used for starting motors up to what horsepower?

 Divergence of gradient of a vector function is equivalent to

A wire of diameter 1 mm and conductivity of 5 × 10^7 S/m has 10^29 free electrons/m^3 when an electric field of 10 mV/m is applied. Determine the current density.

A parallel plate capacitor has a charge of 10^-6 C on each plate and a potential difference of 2000 V between the plates. What is the value of the capacitance (in F)?

A rectangular hollow metal waveguide has dimensions a = 2.29 cm and b = 1.02 cm. Microwave power at 10 GHz is transmitted through the waveguide in the TE₁₀ mode. What is the cut-off wavelength for this mode?

The characteristics equations of a Hybrid coupler are:

α = real power coming out of collinear port

β = imaginary power

θ = E-plane angle

φ = H-plane angle

In a manual shunt motor starter, the overload relay and no-volt relay are connected in which way?