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Electricity and Magnetism
a .25 meter long coil consist of 560 square turns 6.5 cm on a side the coil is placed in a uniform magnetic field of strength 1.2 teslas. Initially the coil is oriented so that its axis coincides with the magnetic field direction. the coil is then rotated 90 degrees about an axis perpendicular to the magnetic field direction in .20 miliseconds. what is the magnitude of the emF induced in the coil
Electricity and Magnetism
For a uniform plane wave of frequency 10 GHz propagating in a polystyrene. Calculate the
attenuation constant, phase velocity and intrinsic impedance.
attenuation constant, phase velocity and intrinsic impedance.
Electricity and Magnetism
a) Derive the expression for the group velocity of a uniform plane wave propagating in a
good conductor and compare with phase velocity in the conductor
good conductor and compare with phase velocity in the conductor
Electricity and Magnetism
Two equal point charges A and B are R distance apart. A third point charge placed on the perpendicular
bisector at a distance ‘d’ from the centre will experience maximum electrostatic force when
bisector at a distance ‘d’ from the centre will experience maximum electrostatic force when
Electricity and Magnetism
Calculate the potential difference between the plates of a parallel plate capacitor so that the gravitational force on a proton would be balanced by the electric field (proton mass =
1.67×10−27kg
, electronic charge
e=1.6×10−19C
, plate separation is 0.5cm. Take
g=9.8m/s2)
1.67×10−27kg
, electronic charge
e=1.6×10−19C
, plate separation is 0.5cm. Take
g=9.8m/s2)
Electricity and Magnetism
A dielectric of relative permittivity or dielectric constant 3.0 is filled into the space between the plates of a capacitor. Find the factor by which the capacitance is increased, if the dielectric is only sufficient to fill up 3/4 of the gap
Electricity and Magnetism
Given that the relative permittivity of porcelain 6.0, calculate its electrical susceptibility in the presence of an electric field
Electricity and Magnetism
A typical polar molecule has a dipole moment of the order of magnitude
1.6 × 10 −29 Cm
. Calculate the energy required to reverse its direction to be opposite to an electric field of intensity
10 6 V / m
1.6 × 10 −29 Cm
. Calculate the energy required to reverse its direction to be opposite to an electric field of intensity
10 6 V / m
Electricity and Magnetism
A certain capacitor has a capacitance of 50 pF with air between its plates and 370 pF with a plastic between its plates. What is the dielectric constant of the plastic?
Electricity and Magnetism
Two parallel plates of
100 cm 2
each are given equal and opposite charges of
8.9 × 10 −7 C
. The electric field within the dielectric material filling the space between the plates is
1.4 × 10 6 V / m
. Find dielectric constant of the material.
100 cm 2
each are given equal and opposite charges of
8.9 × 10 −7 C
. The electric field within the dielectric material filling the space between the plates is
1.4 × 10 6 V / m
. Find dielectric constant of the material.
