Achiever Study Plan ESE-2018: Electromagnetic Field Theory Quiz 2

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Question 1

Point charges of –10 nC and 10 nC are located in free space at (–1, 0, 0) m and (1, 0, 0) m respectively. What is the energy stored in the field?

• AZero
• B450 nJ
• C–450 nJ
• D–900 nJ

Question 2

Equipotential surface about a pair of equal and opposite linear charges exist in what form?

• AConcentric spheres
• BConcentric cylinders
• CNon-concentric cylinders
• DPlanes

Question 3

Image theory is applicable to problems involving

• Aelectrostatic field only
• Bmagnetistatic field only
• Cboth electrostatic and magnetostatic fields
• Dneither electrostatic nor magnetostatic field

Question 4

Sphere of radius a with a uniform charge density shall have electric flux density at r = a, equal to

• A
• B
• C
• D

Question 5

A spherical balloon of radius a is charged. The energy density in the electric field at a point P shown in the figure given below is w. If the balloon is inflated to a radius b without altering its charge, what is the energy density at P?

• A
• B
• C
• Dw

Question 6

Where is the Laplace's equation valid?

• AOnly in free space
• BOnly in conductors
• COnly in charge free dielectric regions
• DOnly in cavities bounded on all sides by conducting walls

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