If the electric potential is given, which of the following cannot be calculated?

A)
Electrostatic energy
B)
Permittivity
C)
Electric flux density
D)
Electric field intensity

Correct Answer : Option (A) :   Electrostatic energy

Explanation : Using potential, we can calculate electric field directly by gradient operation. From E, the flux density D can also be calculated. Thus it is not possible to calculate energy directly from potential.

Recently Updated in Electromagnetic Field Theory Questions
Radiation intensity in a given direction is the
A)
Energy radiated per square metre
B)
Power radiated per square metre
C)
Power radiated per unit solid angle in that direction
D)
None of the above

Correct Answer :   Power radiated per unit solid angle in that direction

Which of the following impedance inversion is obtained?
A)
Balun transformer
B)
A quarter wave line
C)
Short-circuited stub
D)
A half wave line

Correct Answer :   A quarter wave line

The wave in wave guide has
A)
Larger frequency than in the free space
B)
Diminishing wavelength than in the free space
C)
Group velocity inversely proportional to wavelength
D)
Larger wavelength than in the free space

Correct Answer :   Larger wavelength than in the free space

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Power Electronics
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