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Electricity and Magnetism
Carbon tetrachloride at 20 degrees celcius has relative permittivity of 2.24 and density of
1.60 g / cm 3
. Its molecular weight is 156. Calculate the dipole moment of a single molecule of the substance when it is in an electric field of
10 7 V / m
1.60 g / cm 3
. Its molecular weight is 156. Calculate the dipole moment of a single molecule of the substance when it is in an electric field of
10 7 V / m
Electricity and Magnetism
The dielectric strength of polyethylene (i.e. the electric field value above which a spark will jump through the material) is about
1.8 × 10 5 V / cm
. The dielectric constant for polyethylene is 2.3. If polyethylene fills the gap between two metal plates 0.20 cm apart, how large a voltage difference can be applied to the two plates before
1.8 × 10 5 V / cm
. The dielectric constant for polyethylene is 2.3. If polyethylene fills the gap between two metal plates 0.20 cm apart, how large a voltage difference can be applied to the two plates before
Electricity and Magnetism
describe the direction and shape of magnetic field lines of a bar magnet
Electricity and Magnetism
Find electric intensity midway between the charges +1.36x10-9 coul and -1.36x10-9 coul separated by a distance of 80 cm.
Electricity and Magnetism
A 1000-turn solenoid of length 20cm has a cross-sectional area of 2.0 square centimetre. Find the inductance of the coil if the core is air.
Electricity and Magnetism
An electron with momentum 5.60 x 10^-19 kg*m/s moves in a circle of radius 5m in uniform magnetic field. What is the magnitude of themagnetic field?
Electricity and Magnetism
An electron has a velocity of 6.0 106 m/s in the positive x direction at a point where the magnetic field has the components Bx = 3.0 T, By = 1.5 T, and Bz = 2.0 T. What is the magnitude of the acceleration of the electron at this point?
Electricity and Magnetism
Which of the following statements is NOT correct about polarisation of an atom, ion or molecule?
A. An atom, ion or polar molecule has zero dipole moment in a zero field
B. the permanent dipole moment of polar molecules are randomly oriented in zero field
C. in the presence of a field the orientation of polar molecules in which the dipole moment is parallel to the field have
lower energy and so are statistically more favourable
D. in an ionic lattice the positive ions are displaced in the direction opposite to the field
A. An atom, ion or polar molecule has zero dipole moment in a zero field
B. the permanent dipole moment of polar molecules are randomly oriented in zero field
C. in the presence of a field the orientation of polar molecules in which the dipole moment is parallel to the field have
lower energy and so are statistically more favourable
D. in an ionic lattice the positive ions are displaced in the direction opposite to the field
Electricity and Magnetism
The polarisation of a dielectric material and the internal depolarising field when it placed in an external field are
Electricity and Magnetism
After a parallel plate
air filled
capacitor has been charged to 70 V potential difference, the capacitor is disconnected
from the the voltage source. A sheet of plastic, dielectric constant k = 3.50, is slipped between its plates so as to fill the
gap. What now is the potential difference between the plates if it is assumed that no charge left the capacitor's metal
plates?
air filled
capacitor has been charged to 70 V potential difference, the capacitor is disconnected
from the the voltage source. A sheet of plastic, dielectric constant k = 3.50, is slipped between its plates so as to fill the
gap. What now is the potential difference between the plates if it is assumed that no charge left the capacitor's metal
plates?
