Electromagnetic Fields Objective Questions – Set 5

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

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

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

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

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 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

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

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

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

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

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

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

The Kirchhoff’s current law is implict in expression

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

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

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

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

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

If the static magnetic flux density is B, then

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

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

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

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

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 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

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

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

Skin depth is proportional to