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Calculate the emf in a material with flux linkage of 3.5t2 at 2 seconds.
c Explanation: The emf induced in a material with flux linkage is given by Vemf = -dλ/dt. On substituting λ= 3.5t2, we get emf = -7t. At time t = 2sec, the emf will be -14 units.
c
See lessExplanation: The emf induced in a material with flux linkage is given by Vemf = -dλ/dt. On substituting λ= 3.5t2, we get emf = -7t. At time t = 2sec, the emf will be -14 units.
The dipole formation in a magnet is due to
a Explanation: In any magnetic material or magnet, the dipoles exist. This is due to the magnetic lines of force joining the north to south poles. The interaction between these two poles together leads to dipole formation.
a
See lessExplanation: In any magnetic material or magnet, the dipoles exist. This is due to the
magnetic lines of force joining the north to south poles. The interaction between these
two poles together leads to dipole formation.
Which equation will hold good for a magnetic material?
d Explanation: We know that the divergence of B is zero. From Stokes theorem, the surface integral of B is equal to the volume integral of divergence of B. Thus surface integral of B is also zero.
d
See lessExplanation: We know that the divergence of B is zero. From Stokes theorem, the
surface integral of B is equal to the volume integral of divergence of B. Thus surface
integral of B is also zero.
Will dielectric breakdown lead to formation of magnetic monopole?
b Explanation: When dielectric breakdown occurs, the material loses its dielectric property and becomes a conductor. When it is subjected to a magnetic field, north and south flux lines coexists, giving magnetic force. Thus there exists magnetic dipole. Suppose if the conductor is broken into very sRead more
b
See lessExplanation: When dielectric breakdown occurs, the material loses its dielectric property and becomes a conductor. When it is subjected to a magnetic field, north and south flux lines coexists, giving magnetic force. Thus there exists magnetic dipole. Suppose if the conductor is broken into very small pieces, still there exist a magnetic dipole in every broken part. In other words, when a piece is broken into half, there cannot exist a north pole in one half and a south pole in the other. Thus monopoles never exist.
The non existence of the magnetic monopole is due to which operation?
b Explanation: The Maxwell fourth law or the Gauss law for magnetic field states that the divergence of B is zero, implies the non existence of magnetic monopoles. Thus the operation involved is divergence.
b
See lessExplanation: The Maxwell fourth law or the Gauss law for magnetic field states that the divergence of B is zero, implies the non existence of magnetic monopoles. Thus the operation involved is divergence.
The reason for non existence of magnetic monopoles is
a Explanation: Practically monopoles do not exist, due to the connection between north and south poles. But theoretically, they exist. The reason for their non- existence practically is that, the magnetic field confined to two poles cannot be split or confined to a single pole.
a
See lessExplanation: Practically monopoles do not exist, due to the connection between north
and south poles. But theoretically, they exist. The reason for their non- existence
practically is that, the magnetic field confined to two poles cannot be split or confined to a single pole.
The sequence for finding H from E is
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.
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.
The Gauss law for magnetic field is valid in
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.
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.
Find the sequence to find B when E is given.
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.
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.
Which equation will be true, if the medium is considered to be air?
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.
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.