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The permeability and permittivity of air or free space is unity. State true/false.
b Explanation: The permeability and permittivity of free space or air is always unity. This implies that the air is always ready to store electric or magnetic charges subjected to it.
b
See lessExplanation: The permeability and permittivity of free space or air is always unity. This implies that the air is always ready to store electric or magnetic charges subjected to it.
Very small and positive susceptibility is found in
c Explanation: Paramagnetic materials are characterized by a small and positive susceptibility. The susceptibility and the temperature are directly related.
c
See lessExplanation: Paramagnetic materials are characterized by a small and positive
susceptibility. The susceptibility and the temperature are directly related.
Which of the following relation will hold good?
d Explanation: The magnetic flux density is the product the permeability and the magnetic field intensity. This statement is always true for any material (permeability).
d
See lessExplanation: The magnetic flux density is the product the permeability and the magnetic field intensity. This statement is always true for any material (permeability).
The magnetostatics highly relies on which property?
c Explanation: The magnetostatics highly relies on the inductance of the magnetic materials, which decides its behavior in the influence of magnetic field.
c
See lessExplanation: The magnetostatics highly relies on the inductance of the magnetic
materials, which decides its behavior in the influence of magnetic field.
The inductance is the measure of
a Explanation: The total flux in a coil is defined by φ = BA, where B = 12 and A = 0.07. On substituting these values, we get φ = 12 x 0.07 = 0.84 units.
a
See lessExplanation: The total flux in a coil is defined by φ = BA, where B = 12 and A = 0.07. On substituting these values, we get φ = 12 x 0.07 = 0.84 units.
Find the total flux in a coil of magnetic flux density 12 units and area 7 units.
a Explanation: The total flux in a coil is defined by φ = BA, where B = 12 and A = 0.07. On substituting these values, we get φ = 12 x 0.07 = 0.84 units.
a
See lessExplanation: The total flux in a coil is defined by φ = BA, where B = 12 and A = 0.07. On substituting these values, we get φ = 12 x 0.07 = 0.84 units.
Find the energy of a coil of inductance 18mH and current passing through it 1.25A.(in 10-3 order)
a Explanation: The magnetic energy possessed by a coil is given by E = 0.5 x LI2. Put L =18 x 10-3 and I = 1.25, thus we get E = 0.5 x 18 x 10-3 x 1.252 = 14.06 x 10-3 units.
a
See lessExplanation: The magnetic energy possessed by a coil is given by E = 0.5 x LI2. Put L =18 x 10-3 and I = 1.25, thus we get E = 0.5 x 18 x 10-3 x 1.252 = 14.06 x 10-3 units.
Using Maxwell equation which of the following cannot be calculated directly?
c Explanation: The Maxwell equations can be used to compute E,H,D,B and J directly. It is not possible to find the magnetic vector potential A directly.
c
See lessExplanation: The Maxwell equations can be used to compute E,H,D,B and J directly. It is not possible to find the magnetic vector potential A directly.
The energy of a coil depends on the turns. State True/False.
a Explanation: The inductance is directly proportional to square of the turns. Since the energy is directly proportional to the inductance, we can say both are dependent on each other.
a
See lessExplanation: The inductance is directly proportional to square of the turns. Since the
energy is directly proportional to the inductance, we can say both are dependent on
each other.
Find the turns in an solenoid of inductance 23.4mH , current 2A and area 15cm.
c Explanation: The inductance of any material(coil) is given by L = μ N2A/I. Put L = 23.4 x 10-3, I = 2 and A = 0.15, we get N as 498 turns.
c
See lessExplanation: The inductance of any material(coil) is given by L = μ N2A/I.
Put L = 23.4 x 10-3, I = 2 and A = 0.15, we get N as 498 turns.