GATE 2019: Electromagnetics Quiz 2

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Question 1

Electrostatic field within a perfect conductor is ______________.

• AZero
• BUnity
• CHalf of the electrostatic field at the surface.
• DInfinity

Question 2

Point charges 1mC and -2mC are located at (3,2, -1) and (-1, -1 ,4) respectively. A 10nC charge is located at (0,3,1). What will be the electric field intensity at that point?

• A-650.7a_x - 381.7a_y + 750.6a_z kV/m
• B+786.4a_x - 341.7a_y + 686.4a_z kV/m
• C+650.7a_x + 381.7a_y + 605.7a_z kV/m
• D-786.4a_x + 381.7a_y – 605.7a_z kV/m

Question 3

Which of the following is not an example of convection current?

• AA moving charge belt.
• BElectronic movement in vacuum.
• CAn electron beam in television tube.
• DElectric current flowing in a copper wire.

Question 4

In a Van de Graff generator, a charge is transported on a moving belt from the base to the dome. If a charge configuration with surface charge density 10^-7 C/m² is transported at a velocity of 2 m/s, what will the amount of charge collected in 5 seconds? [Consider the width of the belt as 10cm.]

• A1000nC
• B10nC
• C100nC
• D500nC

Question 5

A homogenous dielectric fills region while region is perfect conductor as shown in the figure

If the surface charge on the conductor is 5nC/m², then electric field intensity is

• A(V/m)
• B(V/m)
• C(V/m)
• D(V/m)

Question 6

Two concentric conducting spheres having radii 3 cm and 5 cm are centered at the origin. The potential on the inner sphere is 100 V, while the outer sphere is at -100 V The medium between them is filled with a homogenous dielectric having Ɛr = 2.0. Find the potential function and the value of ‘r’ at which V = 0.

• A V, 0.0375 m
• B, 0.0375 m
• C, 0.03 m
• D, 0.0375 m

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