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The curl of the electric field intensity is
b Explanation: The curl of electric field intensity is Curl(E). From Maxwell law, the curl of E is a non-zero value. Thus E will be rotational.
b
See lessExplanation: The curl of electric field intensity is Curl(E). From Maxwell law, the curl of E is a non-zero value. Thus E will be rotational.
The correct sequence to find H, when D is given is
a Explanation: There is no direct relation between D and H, so the option D-H is not possible. Using the formula D = εE, the parameter E can be computed from D. By Maxwell equation, Curl(E) = -dB/dt, the parameter B can be calculated. Using the formula B = μH, the parameter H can be calculated. ThusRead more
a
See lessExplanation: There is no direct relation between D and H, so the option D-H is not
possible. Using the formula D = εE, the parameter E can be computed from D. By
Maxwell equation, Curl(E) = -dB/dt, the parameter B can be calculated. Using the
formula B = μH, the parameter H can be calculated. Thus the sequence is D-E-B-H.
The benefit of Maxwell equation is that
a Explanation: The Maxwell equation relates the parameters E, D, H, B. When one parameter is known the other parameters can be easily calculated. In other words, it is used to relate an electric field parameter with its equivalent magnetic field.
a
See lessExplanation: The Maxwell equation relates the parameters E, D, H, B. When one
parameter is known the other parameters can be easily calculated. In other words, it is
used to relate an electric field parameter with its equivalent magnetic field.
The first Maxwell law is based on which law?
d Explanation: The first Maxwell equation states that Curl(E) = -dB/dt. It is based on the emf concept. Thus it is derived from the Faraday and Lenz law.
d
See lessExplanation: The first Maxwell equation states that Curl(E) = -dB/dt. It is based on the emf concept. Thus it is derived from the Faraday and Lenz law.
The line integral of the magnetic field intensity is given by
d Explanation: The line integral of H is given by ∫H. dl. From Ampere law it can be related to the current density and hence the current element NI for a coil of N turns. Thus, ∫H. dl = NI.
d
See lessExplanation: The line integral of H is given by ∫H. dl. From Ampere law it can be related to the current density and hence the current element NI for a coil of N turns. Thus, ∫H. dl = NI.
Ampere turn is equivalent to which element?
a Explanation: Ampere turn refers to the current element, which is the product of the turns and the current. It is given by NI. From the definition of reluctance, S = NI/φ. Thus NI = Sφ is the best equivalent.
a
See lessExplanation: Ampere turn refers to the current element, which is the product of the turns and the current. It is given by NI. From the definition of reluctance, S = NI/φ. Thus NI = Sφ is the best equivalent.
Calculate the reluctance of a material with length 2π x 10-4 in air with area 0.5.
d Explanation: The reluctance is given by S = L/μ A, where L is the length, A is the area and μ is the permeability. On substituting L = 2π x 10-4, A = 0.5 and μ = 4π x 10-7, we get S = 103 /(2×0.5) = 1000 units.
d
See lessExplanation: The reluctance is given by S = L/μ A, where L is the length, A is the area and μ is the permeability. On substituting L = 2π x 10-4, A = 0.5 and μ = 4π x 10-7, we get S = 103 /(2×0.5) = 1000 units.
Calculate the reluctance of the material with a mmf of 3.5 units and flux of 7units.
c Explanation: The reluctance is defined as the ratio of the mmf and the flux. It is given by S = mmf/φ. On substituting mmf = 3.5 and φ = 7, we get S = 3.5/7 = 0.5 units.
c
See lessExplanation: The reluctance is defined as the ratio of the mmf and the flux. It is given by S = mmf/φ. On substituting mmf = 3.5 and φ = 7, we get S = 3.5/7 = 0.5 units.
The resistance in a magnetic material is called as
c Explanation: The reluctance of a magnetic material is the ability of the material to oppose the magnetic flux. It is the ratio of the magnetic motive force mmf to the flux.
c
See lessExplanation: The reluctance of a magnetic material is the ability of the material to
oppose the magnetic flux. It is the ratio of the magnetic motive force mmf to the flux.
The flux lines of two energised coils overlapping on each other will give
a Explanation: Flux lines are the magnetic lines of force of a magnetic material. Since the flux is overlapping, the total flux of the two coils together will be high. Thus it is an aiding flux. Also this type of overlapping is possible only when the two coils are back to back or in series connectioRead more
a
See lessExplanation: Flux lines are the magnetic lines of force of a magnetic material. Since the flux is overlapping, the total flux of the two coils together will be high. Thus it is an aiding flux. Also this type of overlapping is possible only when the two coils are back to back or in series connection.