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In metals which of the following equation will hold good?
a Explanation: Generally, the Curl(H) is the sum of two currents- conduction and displacement. In case of metals, it constitutes conduction J and in case of dielectrics, it constitutes the displacement current dD/dt.
a
See lessExplanation: Generally, the Curl(H) is the sum of two currents- conduction and
displacement. In case of metals, it constitutes conduction J and in case of dielectrics, it constitutes the displacement current dD/dt.
The charge build up in the capacitor is due to which quantity?
b Explanation: The charge in the capacitor is due to displacement current. It is the current in the presence of the dielectric placed between two parallel metal plates.
b
See lessExplanation: The charge in the capacitor is due to displacement current. It is the current in the presence of the dielectric placed between two parallel metal plates.
In which of the following forms can Maxwell’s equation not be represented?
a Explanation: Maxwell equations can be represented in differential/point form and integral form alternatively. Sometimes, it can be represented by time varying fields called harmonic form.
a
See lessExplanation: Maxwell equations can be represented in differential/point form and integral form alternatively. Sometimes, it can be represented by time varying fields called harmonic form.
The Faraday’s law states about which type of EMF?
a Explanation: The stationary loop in a varying magnetic field results in an induced emf due to the change in the flux linkage of the loop. This emf is called as induced or transformer EMF.
a
See lessExplanation: The stationary loop in a varying magnetic field results in an induced emf
due to the change in the flux linkage of the loop. This emf is called as induced or
transformer EMF.
Find the Maxwell law derived from Ampere law.
c Explanation: From the current density definition and Ohm’s law, the Ampere circuital lawCurl(H) = J can be derived. This is Maxwell’s second law of electromagnetics.
c
See lessExplanation: From the current density definition and Ohm’s law, the Ampere circuital lawCurl(H) = J can be derived. This is Maxwell’s second law of electromagnetics.
Find the Maxwell equation derived from Faraday’s law.
c Explanation: From the Faraday’s law and Lenz law, using Stoke’s theorem, we get Curl(E) = -dB/dt. This is the Maxwell’s first law of electromagnetics.
c
See lessExplanation: From the Faraday’s law and Lenz law, using Stoke’s theorem, we get
Curl(E) = -dB/dt. This is the Maxwell’s first law of electromagnetics.
Find the charge density when the electric flux density is given by 2x i + 3y j + 4z k.
b Explanation: The charge density is the divergence of the electric flux density by Maxwell’s equation. Thus ρ = Div (D) and Div (D) = 2 + 3 + 4 = 9. We get ρ = 9 units.
b
See lessExplanation: The charge density is the divergence of the electric flux density by
Maxwell’s equation. Thus ρ = Div (D) and Div (D) = 2 + 3 + 4 = 9. We get ρ = 9 units.
The divergence of which quantity will be zero?
d Explanation: The divergence of the magnetic flux density is always zero. This is because of the non existence of magnetic monopoles in a magnetic field.
d
See lessExplanation: The divergence of the magnetic flux density is always zero. This is because of the non existence of magnetic monopoles in a magnetic field.
When the rotational path of the magnetic field intensity is zero, then the current in the path will be
b Explanation: By Ampere law, Curl(H) = J. The rotational path of H is zero, implies the curl of H is zero. This shows the current density J is also zero. The current is the product of the current density and area, which is also zero.
b
See lessExplanation: By Ampere law, Curl(H) = J. The rotational path of H is zero, implies the
curl of H is zero. This shows the current density J is also zero. The current is the product of the current density and area, which is also zero.
Find the magnetic field intensity when the current density is 0.5 units for an area up to 20 units.
a Explanation: We know that ∫ H.dl = I. By Stoke’s law, we can write Curl(H) = J. In integral form, H = ∫ J.ds, where J = 0.5 and ds is defined by 20 units. Thus H = 0.5 x 20 = 10 units.
a
See lessExplanation: We know that ∫ H.dl = I. By Stoke’s law, we can write Curl(H) = J. In integral form, H = ∫ J.ds, where J = 0.5 and ds is defined by 20 units. Thus H = 0.5 x 20 = 10
units.