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WorksheetsEC8451 EMF - UNIT - III (MAGNETOSTATICS)
Total questions: 30
Worksheet time: 30mins
Biot Savart law in magnetic field is analogous to which law in electric field?
Gauss law
Faraday law
Coulomb’s law
Ampere law
Which of the following cannot be computed using the Biot Savart law?
Magnetic field intensity
Magnetic flux density
Electric field intensity
Permeability
Find the magnetic field of a finite current element with 2A current and height 1/2π is
1
2
1/2
1/4
Calculate the magnetic field at a point on the centre of the circular conductor of radius 2m with current 8A.
1
2
3
4
The current element of the solenoid of turns 100, length 2m and current 0.5A is given by,
100 dx
200 dx
25 dx
50 dx
The point form of Ampere law is given by
Curl(B) = I
Curl(D) = J
Curl(V) = I
Curl(H) = J
The Ampere law is based on which theorem?
Green’s theorem
Gauss divergence theorem
Stoke’s theorem
Maxwell theorem
When the rotational path of the magnetic field intensity is zero, then the current in the path will be
1
0
∞
0.5
Find the magnetic field intensity when the current density is 0.5 units for an area up to 20 units.
10
5
20
40
The divergence of which quantity will be zero?
E
D
H
B
Find the Maxwell law derived from Ampere law.
Div(I) = H
Div(H) = J
Curl(H) = J
Curl(B) = D
The H quantity is analogous to which component in the following?
B
D
E
V
Ampere law states that,
Divergence of H is same as the flux
Curl of D is same as the current
Divergence of E is zero
Curl of H is same as the current density
Given the magnetic field is 2.4 units. Find the flux density in air(in 10-6 order).
2
3
4
5
Find the electric field when the magnetic field is given by 2sin t in air.
8π x 10-7 cos t
4π x 10-7 sin t
-8π x 10-7 cos t
-4π x 10-7 sin t
Find the magnetic field intensity due to a solenoid of length 12cm having 30 turns and current of 1.5A.
250
325
175
375
Identify which of the following is the unit of magnetic flux density?
Weber
Weber/m
Tesla
Weber-1
The divergence of H will be
1
-1
∞
0
Find the current when the magnetic field intensity is given by 2L and L varies as 0->1.
2
1
0.5
0
If ∫ H.dL = 0, then which statement will be true?
E = -Grad(V)
B = -Grad(D)
H = -Grad(Vm)
D = -Grad(A)
Find the magnetic flux density of the material with magnetic vector potential A = y i + z j + x k.
i + j + k
–i – j – k
–i-j
–i-k
Find the magnetic field intensity when the magnetic vector potential x i + 2y j + 3z k.
6
-6
0
1
In Ampere's circuital law, what is the purpose of an 'Amperian Path'?
Computation of magnetic field intensity
Determination of differential element of path length
Estimation of electric flux density
Detection of loop in a constant plane
What is the direction of magnetic field intensity vector due to infinite long straight filament?
Radial
Elliptical
Parabolic
Circumferential
Which co-ordinate/s serve/s to be a function of magnitude of magnetic field intensity due to infinite long straight filament?
0
Φ
z
r
In magnetism, Biot-Savart law is well-known as _____ law of current element
Ampere's
Coulomb's
Joule's
Ohm's
In a magnetic flux density, the total magnetic lines of force crossing a unit area in plane to the direction of flux are at _______
Acute angles
Obtuse angles
Right angles
None of the above
The Laplacian of the magnetic vector potential will be
–μ J
– μ I
–μ B
–μ H
The magnetic vector potential for a line current will be inversely proportional to
dL
I
J
R
The current element of the magnetic vector potential for a surface current will be
J dS
I dL
K dS
J dV
