Electromagnetic Fields Objective Questions
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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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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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Gradient of scalar field is expressed as
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Which of the following statement are incorrect?
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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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What is the value of skin depth as 100 Hz in a material having μ_{r} = 1.0 and & σ = 3.60 × 10_{7} s/m
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A potential field is given by V = 3x^{2} y – yz. The electric field at P(2, 1, 4) is
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The work done by a force = 4u_{n}  3u_{y} + 2u_{z} N in giving a inc charge a displacement of (10 u_{x} + 2u_{y}  7u_{z}) m is
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If in a 1 mF capacitor, an instantaneous displacement current of 1 A is to be established in the spaces between its plates then it is possible by
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A vector field A = p 1_{n} is given in Cartesian coordinates. In cylindrical coordinates it will be represented as
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Skin depth is proportional to
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A circular ring carrying uniformly distributed charge q and a point charge – Q on the axis of the ring. The magnitude of dipolement of the charge system is (Assume distance between centre of ring and point charge is d and radius of ring R)
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An electric field of 1.92 × 10^{3} N/c is maintained across two plates separated 0.015 m. Potential difference across plates will be
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Plane z = 10 m carries change 20 c/m^{2}. The electric field intensity at the origin is
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An infinite non conducting sheet of charge has σ of 10^{7} c/m^{3}. Equipotential surface for a potential of 10 volts is.
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A sphere of radius with a uniform charge density ρv C/m^{3} shall have electric flux density at the radius r = a equal to
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If E is the electric field intensity, then what is the value of divergence of (curl of E)?
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The electric flux is given D = (2y^{2} + z) I_{x} + 4xy I_{y} + x 1_{z} C/m^{2}. The volume charge density at point (1,0,3) is
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Between a hollow and solid metal sphere, charge reside
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In a dielectric material an applied field in x direction E_{x} = 5 v/m gives a polarization of p_{x} = 3/10π u_{x} nc/m2. The susceptibility of the material is
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A dipole having a moment p – 3u_{x}  5u_{y} + 10u_{z} ncm is located at p(1,2,4) in free space. The V as Q(2,3,4) is
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In a lossless medium the intrinsic impedance η 60π and μ_{r} = 1. The relative dielectric constant ε_{r} shall be
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Two sphere of radius r_{1} and r_{2} are connected by a conducting wire. Each of the spheres has been given a charge Q. Now
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A sphere of zoo radius contains electrical charge of density 2/(r sinθ) c/m^{3}. What is the total charge contained within the sphere?
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A pure inductor is connected across a voltage source. Find the active power drawn by the inductor?
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Which statement does not say that electrostatic field conservative?
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The electrical field strength at a distance point A due to a point charge +q, located at the origin, is 100 &mul v/m. If the point charge is now enclosed by a perfectly conducting metal sheet sphere whose centre is at origin, A, outside the sphere, becomes
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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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An infinite sheet has a charge density of 150 μ C/m. The flux density in μ C/m^{2} is
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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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