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309. The sequence for finding H from E is a) E-B-H b) E-V-H c) E-D-H d) E-A-H
Answer: a Explanation: From E, we can compute B using the Maxwell first law. Using B, the parameter H can be found since B = μH. Thus the sequence is E-B-H is true.
Answer: a
See lessExplanation: From E, we can compute B using the Maxwell first law. Using B, the
parameter H can be found since B = μH. Thus the sequence is E-B-H is true.
308. The Gauss law for magnetic field is valid in a) Air b) Conductor c) Dielectric d) All cases
Answer: d Explanation: The Gauss law for magnetic field states that the divergence of B is always zero. This is valid for all cases like free space, dielectric medium etc.
Answer: d
See lessExplanation: The Gauss law for magnetic field states that the divergence of B is always
zero. This is valid for all cases like free space, dielectric medium etc.
307. Find the sequence to find B when E is given. a) E-D-H-B b) B-E-D c) H-B-E-D d) V-E-B
Answer: a Explanation: From E, D can be computed as D = εE. Using the Ampere law, H can be computed from D. Finally, B can be calculated from H by B = μH.
Answer: a
See lessExplanation: From E, D can be computed as D = εE. Using the Ampere law, H can be
computed from D. Finally, B can be calculated from H by B = μH.
306. Which equation will be true, if the medium is considered to be air? a) Curl(H) = 0 b) Div(H) = 0 c) Grad(H) = 0 d) Div(H) = 1
Answer: b Explanation: From the Gauss law for magnetic field, the divergence of the magnetic flux density is zero. Also B = μH. Thus divergence of H is also zero, i.e, Div(H) = 0 is true.
Answer: b
See lessExplanation: From the Gauss law for magnetic field, the divergence of the magnetic flux
density is zero. Also B = μH. Thus divergence of H is also zero, i.e, Div(H) = 0 is true.
305. Which quantity is solenoidal in the electromagnetic theory? a) Electric field intensity b) Electric flux density c) Magnetic field intensity d) Magnetic flux density
Answer: d Explanation: The divergence of the magnetic flux density is zero. This is the Maxwell fourth equation. As the divergence is zero, the quantity will be solenoidal or divergent less.
Answer: d
See lessExplanation: The divergence of the magnetic flux density is zero. This is the Maxwell
fourth equation. As the divergence is zero, the quantity will be solenoidal or divergent
less.
304. The Gauss law employs which theorem for the calculation of charge density? a) Green theorem b) Stokes theorem c) Gauss theorem d) Maxwell equation
Answer: c Explanation: The Gauss divergence theorem is given by ∫ D.ds = ∫Div(D).dv. From the theorem value, we can compute the charge density. Thus Gauss law employs the Gauss divergence theorem.
Answer: c
See lessExplanation: The Gauss divergence theorem is given by ∫ D.ds = ∫Div(D).dv. From the
theorem value, we can compute the charge density. Thus Gauss law employs the Gauss
divergence theorem.
302. The charge density of a system with the position vector as electric flux density is a) 0 b) 1 c) 2 d) 3
Answer: d Explanation: The divergence of the electric flux density is the charge density. For a position vector xi + yj + zk, the divergence will be 1 + 1 + 1 = 3. Thus by Gauss law, the charge density is also 3
Answer: d
See lessExplanation: The divergence of the electric flux density is the charge density. For a
position vector xi + yj + zk, the divergence will be 1 + 1 + 1 = 3. Thus by Gauss law, the
charge density is also 3
From the Gauss law for electric field, we can compute which of the following parameters? a) B b) H c) E d) A
Answer: c Explanation: From the Gauss law for electric field, we can find the electric flux density directly. On substituting, D= ε E, the electric field intensity can be calculated.
Answer: c
See lessExplanation: From the Gauss law for electric field, we can find the electric flux density
directly. On substituting, D= ε E, the electric field intensity can be calculated.
330. The gradient of the magnetic vector potential can be expressed as a) –με dV/dt b) +με dE/dt c) –με dA/dt d) +με dB/dt
Answer: a Explanation: The gradient of A is the ratio of the negative gradient of electric potential to the speed of light c. We can write c = 1/√(με). Thus grad(A) = -με dV/dt is the required expression.
Answer: a
See lessExplanation: The gradient of A is the ratio of the negative gradient of electric potential to
the speed of light c. We can write c = 1/√(με). Thus grad(A) = -με dV/dt is the required
expression.
329. When electric potential is null, then the electric field intensity will be a) 0 b) 1 c) dA/dt d) –dA/dt
Answer: d Explanation: The electric field intensity is given by E = -Grad(V)- dA/dt, where V is the electric potential and A is the magnetic vector potential. When V is zero, then E = -dA/dt.
Answer: d
See lessExplanation: The electric field intensity is given by E = -Grad(V)- dA/dt, where V is the
electric potential and A is the magnetic vector potential. When V is zero, then E = -dA/dt.