Test: Electric Dipole


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10 Questions MCQ Test Electromagnetic Fields Theory (EMFT) | Test: Electric Dipole

Test: Electric Dipole for Electrical Engineering (EE) 2023 is part of Electromagnetic Fields Theory (EMFT) preparation. The Test: Electric Dipole questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Electric Dipole MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electric Dipole below.
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Test: Electric Dipole - Question 1

Choose the best definition of a dipole.

Detailed Solution for Test: Electric Dipole - Question 1

Answer: c
Explanation: An electric dipole generally refers to two equal and unlike (opposite signs) charges separated by a small distance. It can be anywhere, not necessarily at origin.

Test: Electric Dipole - Question 2

The potential due to a dipole at a point P from it is the

Detailed Solution for Test: Electric Dipole - Question 2

Answer: b
Explanation: The total potential at the point P due to the dipole is given by the difference of the potentials of the individual charges.
V = V1 + (-V2), since both the charges are unlike. Thus V = V1 – V2.

Test: Electric Dipole - Question 3

Calculate the dipole moment of a dipole with equal charges 2C and -2C separated by a distance of 2cm.

Detailed Solution for Test: Electric Dipole - Question 3

Answer: b
Explanation: The dipole moment of charge 2C and distance 2cm will be,
M = Q x d. Thus, M = 2 x 0.02 = 0.04 C-m.

Test: Electric Dipole - Question 4

Find the angle at which the potential due a dipole is measured, when the distance from one charge is 12cm and that due to other is 11cm, separated to each other by a distance of 2cm.

Detailed Solution for Test: Electric Dipole - Question 4

Answer: d
Explanation: Here, the two charges are separated by d = 2cm.
The distance from one charge (say Q1) will be R1 = 11cm. The distance from another charge (say Q2) will be R2 = 12cm. If R1 and R2 is assumed to be parallel, then R2 – R1 = d cos θ. We get 1 = 2cos θ and cos θ = 0.5. Then θ =
cos-1(0.5) = 60.

Test: Electric Dipole - Question 5

Find the potential due the dipole when the angle subtended by the two charges at the point P is perpendicular.

Detailed Solution for Test: Electric Dipole - Question 5

Answer: a
Explanation: The potential due the dipole is given by, V = m cos θ/(4πεr2). When the angle becomes perpendicular (θ = 90). The potential becomes zero since cos 90 will become zero.

Test: Electric Dipole - Question 6

For two charges 3C and -3C separated by 1cm and are located at distances 5cm and 7cm respectively from the point P, then the distance between their midpoint and the point P will be

Detailed Solution for Test: Electric Dipole - Question 6

Answer: a
Explanation: For a distant point P, the R1 and R2 will approximately be equal.
R1 = R2 = r, where r is the distance between P and the midpoint of the two charges. Thus they are in geometric progression, R1R2=r2
Now, r2 = 5 x 7 = 35. We get r = 5.91cm.

Test: Electric Dipole - Question 7

Calculate the distance between two charges of 4C forming a dipole, with a dipole moment of 6 units.

Detailed Solution for Test: Electric Dipole - Question 7

Answer: b
Explanation: The dipole moment is given by, M = Q x d. To get d, we rearrange the formula d = M/Q = 6/4 = 1.5units.

Test: Electric Dipole - Question 8

The potential due to the dipole on the midpoint of the two charges will be

Detailed Solution for Test: Electric Dipole - Question 8

Answer: c
Explanation: The potential due a dipole at a point P will be V = m cos θ/(4πεr2).
Now it is given that potential on the midpoint, which means P is on midpoint, then the distance from midpoint and P will be zero. When r = 0 is put in the above equation, we get V = ∞. This shows that the potential of a dipole at its midpoint will be maximum/infinity.

Test: Electric Dipole - Question 9

Dipoles in any electric field undergo

Detailed Solution for Test: Electric Dipole - Question 9

Answer: d
Explanation: Dipoles in any pure electric field will undergo polarisation. It is the process of alignment of dipole moments in accordance with the electric field applied.

Test: Electric Dipole - Question 10

Dipole moments are used to calculate the

Detailed Solution for Test: Electric Dipole - Question 10

Answer: b
Explanation: Dipole moment implicates the strength of the dipole in the electric field. They are then used to compute the polarisation patterns based on the applied field. Once the polarisation is determined we can find its susceptibility. Though all options seem to be correct, the apt answer is to calculate polarisation, provided applied field is known.

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