# 290+ Electromagnetic Field Solved MCQs

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1.

## A scalar quantity has __________.

A. magnitude
B. direction
C. both (a) and (b)
D. none of these
2.

A. distance
B. density
C. temperature
D. all of these
3.

A. entropy
B. displacement
C. volume
D. mas
4.

## A vector quantity has __________.

A. magnitude
B. direction
C. both (a) and (b)
D. none of these
Answer» C. both (a) and (b)
5.

## Which of the following is/are vector quantity(s)?

A. force
B. electric field intensity
C. acceleration
D. all of these
6.

A. 0
B. 1
C.
D. none of these
7.

## A unit vector has _______ direction to that of the main vector.

A. same
B. opposite
C. normal upwards
D. normal downwards
8.

A. (Px, Pφ, Pz)
B. (Px, Py, Pz)
C. (Px, Pφ, Pθ)
D. none of these
9.

## ________ of two vectors uses the Law of Parallelogram.

A. multiplication
B. division
D. all of these
10.

## Multiplication of two vectors is __________.

A. vector
B. scalar
C. either vector or scalar
D. cannot say
Answer» C. either vector or scalar
11.

A. 1
B. 0
C.
D. 100
12.

## ___________ product is governed by the Right-Hand Screw Rule.

A. vector
B. scalar
C. simple mathematical
D. none of these
13.

A. Commutative
B. Associative
C. Distributive
D. Parallelogram
14.

A. 0
B. 1
C.
D. 100
15.

## ____________ product of two unit vectors is the third unit vector.

A. vector
B. scalar
C. both (a) and (b)
D. none of these
16.

A. 12
B. 7
C. 10
D. 5
17.

A. 45°
B. 90°
C. 120°
D. 180°
18.

A. (r, φ, z)
B. (r, θ, φ)
C. (x, y, z)
D. all of these
19.

A. (r, φ, z)
B. (r, θ, φ)
C. (x, y, z)
D. all of these
20.

A. (r, φ, z)
B. (r, θ, φ)
C. (x, y, z)
D. all of these
21.

## In Cylindrical coordinate systems, unit vector ar is __________.

B. normal to cylindrical surface at a point
C. both (a) and (b)
D. none of these
Answer» C. both (a) and (b)
22.

A. (x, y)
B. (x + y)
C. (x2/y2)
D. (x2 + y2)1/2
23.

A. tan−1(y/x)
B. z
C. xy/z
D. cot z
24.

## In a Spherical coordinate system, φ is ____________.

A. angle of elevation
B. azimuthal angle
C. distant from the origin to the point
D. all of these
25.

## Spherical coordinate system is a _________.

A. right-handed syste.
B. left-handed system
C. both (a)and (b)
D. none of these
26.

A. y/x
B. x/y
C. tan−1(y/x)
D. tan−1(x/y)
27.

## In a Spherical coordinate system, r is given as ___________.

A. (x + y + z)
B. (x2 + y2 + z2)
C. (x2 + y2 + z2)1/2
D. none
Answer» C. (x2 + y2 + z2)1/2
28.

A. cos θ
B. − cos θ
C. sin θ
D. − sin θ
29.

## In terms of Spherical coordinate system variables, y of Cartesian coordinate system is given as __________.

A. r sin θ cos φ
B. r sin θ sin φ
C. r cos θ sin φ
D. r cos θ cos φ
Answer» B. r sin θ sin φ
30.

A. 0 and 1
B. −∞ and 0
C. 0 and −∞
D. −∞ and ∞
31.

## In the Cylindrical coordinate system, φ ranges from _____________.

A. 0 to less than π
B. 0 to less than 2π
C. 0 to less than 3π
D. 0 to less than 4π
Answer» B. 0 to less than 2π
32.

## Line integral involves _________ product.

A. scalar
B. vector
C. both (a) an (b)
D. none of these
33.

## Del operator is ______________.

A. same as the gradient operator
B. vector differential operator
C. both (a) an (b)
D. none of these
Answer» C. both (a) an (b)
34.

## Gradient represents the __________ of maximum space rate of increase of a scalar field.

A. magnitude
B. direction
C. both (a) an (b)
D. none of these
Answer» C. both (a) an (b)
35.

## (AB) is equal to ___________.

A. A. B
B. A + B
C. 2AB
D. B A + A B
Answer» D. B A + A B
36.

A. n A
B. nAn−1 A
C. nAn A
D. nA
37.

## Divergence of a vector at a point in a vector field is __________ quantity.

A. vector
B. scalar
C. both (a) an (b)
D. none of these
38.

A. surface area
B. volume
C. length
D. none of these
39.

## Divergence at a point is positive if field lines are _________

A. diverging
B. converging
C. both (a) an (b)
D. none of these
40.

A.
B. 1
C. 0
D. −1
41.

## Divergence Theorem is applicable for a ________ that is bounded by a _________.

A. volume, surface
B. surface, volume
C. surface, line
D. line, surface
42.

## Divergence Theorem relates ________ integral to __________ integral.

A. surface, volume
B. line, surface
C. volume, line
D. all of these
43.

## Curl measures _________.

A. rate of change of vector
B. circular rotation
C. both (a) and (b)
D. none of these
Answer» C. both (a) and (b)
44.

## Stoke's Theorem relates, ______ integral to a _______ integral.

A. volume, surface
B. volume, line
C. line, surface
D. all of these
45.

## Laplacian operator ________.

A. is a scalar function
B. is a vector function
C. can be a scalar or vector function
D. none of these
Answer» C. can be a scalar or vector function
46.

## Laplacian of a scalar is __________.

A. scalar
B. vector
C. both (a) and (b)
D. none of these
47.

## Laplacian of a vector is ___________ of gradient of its divergence and its curl of curl.

B. difference
C. multiplication
D. division
48.

A.
B. −1
C. 1
D. 0
49.

A. >>1
B. <<1
C. 0
D. none of these
50.

A. >>1
B. <<1
C. 0
D. none of these
51.

## Electrostatic field is _________ a perfect conductor.

A. same inside
B. infinite inside
C. zero inside
D. none of these
52.

## Potential is _________ a perfect conductor.

A. same inside
B. infinite inside
C. zero inside
D. none of these
53.

A. positive
B. negative
C. unity
D. zero
54.

## Conductivity of dielectric is _________.

A. low
B. high
C. both (a) and (b)
D. cannot say
55.

A. water
B. oxygen
C. CO2
D. alcohol
56.

A. orthogonal
B. contrary
C. same
D. none of these
57.

A. length
B. area
C. volume
D. none of these
58.

A. electric
B. magnetic
C. gravity
D. none of these
59.

A. electric
B. magnetic
C. gravity
D. none of these
60.

## Which of the following is not an inductor?

A. toroid
B. transmission line
C. solenoid
D. none of these
61.

A. zero
B. infinity
C. constant
D. none of these
62.

A. a long
B. a small
C. not a
D. none of these
63.

A. infinity
B. zero
C. unity
D. none of these
64.

## Loss tangent is the same as _________.

A. mutual inductance
B. resistivity
C. conductivity
D. dissipation factor
65.

A. σ/ωε
B. ω/σε
C. ωε/σ
D. σε/ω
66.

## Loss tangent approximates _________.

A. attenuation constant
B. phase constant
C. intrinsic impedance
D. all of these
67.

## The combined effect of electric dipoles is seen in _________.

A. polarization
B. magnetization
C. both (a) and (b)
D. none of these
68.

## The combined effect of magnetic dipoles is seen in _________.

A. polarization
B. magnetization
C. both (a) and (b)
D. none of these
69.

## Permeability of vacuum is given as _________.

A. 4 × 10−7 H/m
B. 14 × 10−7 H/m
C. 4 × 10−9 H/m
D. 14 × 10−9 H/m
Answer» A. 4 × 10−7 H/m
70.

## Magnetic susceptibility is _________.

A. unitless
B. dimensionless
C. both (a) and (b)
D. none of these
71.

## Dipole moment is _________ a right-hand screw, when it is moved in the current's direction in a current loop.

A. orthogonal to the direction of
B. opposite to the direction of
C. in the direction of
D. none of these
Answer» C. in the direction of
72.

A. 2
B. 3
C. 4
D. 5
73.

## Maxwell's equations involve_______.

A. Charge density
B. Current density
C. Magnetic intensity
D. All of these
74.

A. 8.854 × 10−12
B. 6.654 × 10−12
C. 8.854 × 10−10
D. 6.654 × 10−10
75.

## Electric dipole is a pair of __________ and __________ point charges.

A. Equal and same
B. Unequal and same
C. Equal and opposite
D. Unequal and opposite
76.

## Electric flux density________medium.

A. Depends on
B. Independent of
C. Both (a) and (b)
D. None of these
77.

## If work done Wmn is zero, then VN and VM are related as _______.

A. VN + VM = 0
B. VN − VM = 0
C. 2VN + VM = 0
D. VN + 2VM = 0
Answer» B. VN − VM = 0
78.

A. Spherical
B. Cylindrical
C. Planar
D. All of these
79.

A.
B. 1
C. 0
D. None of these
80.

A.
B. 1
C. 0
D. None of these
81.

## Potential energy _____ if a test charge is moved from a lower potential point to a higher potential point.

A. Remains the same
B. Increases
C. Decreases
D. Becomes zero
82.

## In the case of a linear material medium, _________ equation can be derived easily from Gauss' law.

A. Poisson
B. Laplace
C. Both (a) and (b)
D. None of these
Answer» C. Both (a) and (b)
83.

A. Unity
B. Zero
C. Infinity
D. None of these
84.

## Steady magnetic fields are governed by __________ law.

A. Biot–Savart's
B. Ampere's Circuital
C. Both (a) and (b)
D. None of these
Answer» C. Both (a) and (b)
85.

A. Same
B. Opposite
C. None of these
D. Cannot say
86.

## Lorentz force equation comprises __________ and __________ forces.

A. Electric, magnetic
B. Mechanical, chemical
C. Both (a) and (b)
D. None of these
87.

## Magnetic dipole moment is a product of __________.

A. Current and area
B. Area and its direction
C. Current, area and its direction
D. None of these
Answer» C. Current, area and its direction
88.

A. First
B. Second
C. Third
D. Fourth
89.

A. Bio–Savart's
B. Lenz's
C. Ampere's
90.

A. Large
B. Medium
C. Small
D. Very small
91.

A. Lenz's
B. Gauss's
C. Biot–Savart's
92.

## Ampere's Circuital Law can be applied __________ the conductor.

A. Inside
B. Outside
C. Both (a) and (b)
D. None of these
Answer» C. Both (a) and (b)
93.

## Magnetic flux density is the same as __________.

A. Magnetic induction
B. Magnetic field strength
C. Both (a) and (b)
D. None of these
Answer» C. Both (a) and (b)
94.

A. Infinity
B. Zero
C. Unity
D. None of these
95.

A. Positive
B. Negative
C. Double
D. Integral
96.

## Magnetization volume current density in magnetic materials is due to __________.

A. Applied non-uniform magnetic field
B. Non-uniform magnetic susceptibility of material
C. Both (a) and (b)
D. None of these
Answer» C. Both (a) and (b)
97.

B. Gauss's
C. Ampere's
D. All of these
98.

## Conduction current through a wire is __________ displacement current in capacitor.

A. Same as
B. Different from
C. Twice of
D. None of these
99.

A. Infinity
B. Unity
C. Zero
D. None of these
100.

A. Line
B. Surface
C. Volume
D. None of these