Electromagnetic Fields Objective Questions – Set 5

If n is the polarization vector and k is the direction of propagation plane electromagnetic wave, them

A plane wave in a homogeneous medium has E = 50 sin(10⁸t + 2z) uy V/m. What is the direction of wave propagation

Which of the following statement for a divergence of electric and magnetic flux densities

An inductor designed with 400 turns coil wound on an iron core of 16 cm² cross sectional area and with a cut of air gap length of 1 mm. The coil is connected to a 230 V, 50 Hz supply. Neglected coil resistance, core loss, iron reluctance and leakage inductance. Find the current in the inductor.

The hysteresis loop of a magnetic material has an area of 5 cm² with the scale given as 1 cm = 2 AT and 1 cm = 50 mwb At 50 Hz; the total hysteresis loss is

If the static magnetic flux density is B, then

Magnetic field intensity at sentre of circular coil, of diameter 1 m and carrying a current of 2 A is

A circular loop has its radius increasing at a rate of 2 m/s. The loop placed perpendicular to a constant magnetic field of 0.5 wb/m². When the radius of the loop is 4 m. the emf induced in the will be

A magnetic field B = 5 × 10^-2 u_z T exerts a force on 0.02 m conductor along the x-axis. The conductor carried a current of 5 mA in the – u_x direction. What force must be applied to the conductor to hold it in position

The Kirchhoff’s current law is implict in expression

A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of electric field intensity, E, at a distance r (o less than r less than R) inside the sphere

A rectangular loop in the x – z plane bounded by the lines x=o, x=a, z=o and z=b is in a time varying magnetic field is given by B=B^o cosω + a_y. Where B_o is constant, ω is angular frequency and a_y unit vector in the y direction. Now the emf induced in the loop is given

If the static magnetic flux density is B, the average force on the core to reduce the air gap will be

The frequency of the power wave associated with an electromagnetic wave having field as E = e^{-z/δ cos(ω - zδ)} is given by

Which of this statement is not characteristic of a static magnetic field

The magnetic at any point on the axis of current carrying circular coil will be

In frec space E (z,t) = 10³ sin(ωt - βz) u_y v/m. What is the value of H (z,t)

A wire 1 m long carries a current of 5 A and is at angle of 30 with B = 1.5 wb/m⁰. Magnitude of force

Which is the major factor for determining whether a medium is free space, lossless dielectric or a good conductor

Find H for centre of solenoid having finite length d = 1 unit where N = no of turns = 500, 1 = 2 A.

A plane wave magnetic field is represented by B_x = cos(y – ct). The electric and magnetic fields will be zero in the direction

The force on a charge moving with velocity v under the influence of electric and magnetic fields is given by which one of the following

Skin depth is proportional to

A magnetic vector potential is given by the expression A = (- cos x) (cos y) uz. The flux density at the origin is

For a line characteristic impedance zo terminated is load zo/3, the reflection coefficient is

A negative point charge q = - 40 nc is moving with velocity of 6 × 10⁶ m/s on a direction specified by unit vector u_v + 0.6 u_z. Find the magnitude of vector forced on the moving particle by the field B = 2 u_n 3 u_y + 5 u_z mT and E = 2 u_x - 3 u_y + 5 u_z KV/m

A coil of 300 turns is wound on a non magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm². The inductance of the coil corresponding to a magnetizing current of 6 A will be

What is the value of skin depth as 100 Hz in a material having μ_r = 1.0 and &sigma = 3.60 × 10⁷ s/m

What is the unit of magnetic charge

A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of electric field intensity, E, at a distance r (o less than r less than R) inside the sphere