Magnetostatics - Electronic Engineering (MCQ) questions & answers

1)   If a conductor with length of 5m is located along z-direction with a current of about 3A in az direction & B = 0.04 ax (T), then what would be the value of force experienced by conductor?

a. 0.6ax N
b. 0.6ay N
c. 0.6az N
d. None of the above
Answer  Explanation 

ANSWER: 0.6ay N

Explanation:
No explanation is available for this question!
2)   Consider the assertions given below. Which of them represent/s the precise condition/s of Ampere's circuital law for the evaluation of magnetic field intensity?

A. If H is tangential to the path, then its value must be different at all the points
B. At each point on closed path, H is either tangential or normal to the path

a. A is true and B is false
b. A is false and B is true
c. Both A & B are true
d. Both A & B are false
Answer  Explanation 

ANSWER: A is false and B is true

Explanation:
No explanation is available for this question!
3)   In Ampere's circuital law, what is the purpose of an 'Amperian Path'?

a. Computation of magnetic field intensity
b. Determination of differential element of path length
c. Estimation of electric flux density
d. Detection of loop in a constant plane
Answer  Explanation 

ANSWER: Computation of magnetic field intensity

Explanation:
No explanation is available for this question!
4)   What is the direction of magnetic field intensity vector due to infinite long straight filament?

a. Radial
b. Elliptical
c. Parabolic
d. Circumferential
Answer  Explanation 

ANSWER: Circumferential

Explanation:
No explanation is available for this question!
5)   Which co-ordinate/s serve/s to be a function of magnitude of magnetic field intensity due to infinite long straight filament?

a. 0
b. Φ
c. z
d. r
Answer  Explanation 

ANSWER: r

Explanation:
No explanation is available for this question!
6)   What is the value of cross product for two similar unit vectors?

a. Zero
b. Infinity
c. Third unit vector
d. Negative vector
Answer  Explanation 

ANSWER: Zero

Explanation:
No explanation is available for this question!
7)   According to Biot-Savart law, which parameter/s exhibit/s an/the inverse relationship to the differential magnetic field intensity (dH)?

a. Current
b. Magnitude of differential length
c. Sine of angle between filament & line connecting differential length to point
d. Square of the distance from differential element to point
Answer  Explanation 

ANSWER: Square of the distance from differential element to point

Explanation:
No explanation is available for this question!
8)   In magnetism, Biot-Savart law is well-known as _____ law of current element

a. Ampere's
b. Coulomb's
c. Joule's
d. Ohm's
Answer  Explanation 

ANSWER: Ampere's

Explanation:
No explanation is available for this question!
9)   What does the constant 'μ' indicate, while specifying the relation between magnetic flux density (B) and magnetic field intensity (H)?

a. Persistivity
b. Permittivity
c. Permissibility
d. Permeability
Answer  Explanation 

ANSWER: Permeability

Explanation:
No explanation is available for this question!
10)   In a magnetic flux density, the total magnetic lines of force crossing a unit area in plane to the direction of flux are at _______

a. Acute angles
b. Obtuse angles
c. Right angles
d. None of the above
Answer  Explanation 

ANSWER: Right angles

Explanation:
No explanation is available for this question!

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