Electromagnetic Fields Objective Questions
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A magnetic field B = 5 × 10^{2} u_{z} T exerts a force on 0.02 m conductor along the xaxis. 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
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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
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An inductor designed with 400 turns coil wound on an iron core of 16 cm^{2} 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.
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The magnetic at any point on the axis of current carrying circular coil will be
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A wire 1 m long carries a current of 5 A and is at angle of 30 with B = 1.5 wb/m^{0}. Magnitude of force
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Which is the major factor for determining whether a medium is free space, lossless dielectric or a good conductor
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A negative point charge q =  40 nc is moving with velocity of 6 × 10^{6} 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
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A plane wave in a homogeneous medium has E = 50 sin(10^{8}t + 2z) uy V/m. What is the direction of wave propagation
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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
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Magnetic field intensity at sentre of circular coil, of diameter 1 m and carrying a current of 2 A is
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A plane wave magnetic field is represented by B_{x} = cos(y – ct). The electric and magnetic fields will be zero in the direction
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A magnetic vector potential is given by the expression A = ( cos x) (cos y) uz. The flux density at the origin is
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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
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The frequency of the power wave associated with an electromagnetic wave having field as E = e^{z/δ cos(ω  zδ)} is given by
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Which of this statement is not characteristic of a static magnetic field
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Skin depth is proportional to
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What is the unit of magnetic charge
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If the static magnetic flux density is B, the average force on the core to reduce the air gap will be
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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 mm^{2}. The inductance of the coil corresponding to a magnetizing current of 6 A will be
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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/m^{2}. When the radius of the loop is 4 m. the emf induced in the will be
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If n is the polarization vector and k is the direction of propagation plane electromagnetic wave, them
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In frec space E (z,t) = 10^{3} sin(ωt  βz) u_{y} v/m. What is the value of H (z,t)
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The Kirchhoff’s current law is implict in expression
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Find H for centre of solenoid having finite length d = 1 unit where N = no of turns = 500, 1 = 2 A.
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The hysteresis loop of a magnetic material has an area of 5 cm^{2} with the scale given as 1 cm = 2 AT and 1 cm = 50 mwb At 50 Hz; the total hysteresis loss is
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If the static magnetic flux density is B, then
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For a line characteristic impedance zo terminated is load zo/3, the reflection coefficient is
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Which of the following statement for a divergence of electric and magnetic flux densities
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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
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What is the value of skin depth as 100 Hz in a material having μ_{r} = 1.0 and &sigma = 3.60 × 10^{7} s/m
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