Test: Electric Dipole
10 Questions MCQ Test Physics Class 12 | Test: Electric Dipole
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Which of the following molecule has permanent dipole moment?
Ionic behavior implies dipole moment.
HCl is an ionic compound (H+Cl-)
CO2, CH4 and BF3 is a covalent compound
A dipole is said to be in stable equilibrium when angle between electric field and dipole moment is:
Stable equilibrium is attained when potential energy of the dipole system is minimum which is possible at an inclination of 0°.
What is the angle between the electric dipole moment and the electric field on the equatorial line of the dipole?
On equatorial line, the direction of electric field is reversed to that of angle of axial line. Therefore, the angle between dipole moment and electric field is 180°.
An electric dipole is a separation of positive and negative charges. The simplest example of this is a pair of electric charges of equal magnitude but opposite sign, separated by some (usually small) distance. A permanent electric dipole is called an electret.
How does electric field strength change with distance from a short dipole?
Electric Field Intensity due to a short dipole is given by
E = K2P/r^3
where K is the proportionality constant
P is the electric dipole moment
So electric field intensity is inversely proportional to r^3
An electric dipole consists of a positive and negative charge of 4 µC. Each placed at a distance of 5 mm. The dipole moment for the system is
q= 4μc = 4 x 10-6c
2l = 5mm = 5 x 10-3m
Dipole moment P = q.2l
= 4 x 10-6 x 5 x 10-3
= 20 x 10-9
= 2 x 10 x 10-9
= 2 x 10-8 c.m
its direction is toward the positive charge.
Electric flux is a scalar quantity. It is a scalar because it is the dot product of two vector quantities, electric field and the perpendicular differential area.
For forming an electric dipole between two point charges separated by a small distance, the two point charges are of
By definition of Electric Dipole
Positive and negative point charges of equal magnitude are kept at locations ( 0,0,a/2) and (0,0,-a/2) respectively. The work done by the electric field when another positive point charge is moved from (-a,0,0) to (0,a,0) is
+Q charge is moving on equatorial line of dipole as shown in figure, since on equatorial line V=0,
Hence the potential difference is zero. So, W=0
An electric dipole is placed at an angle of 30° with an electric field intensity 2 × 105 N/C. It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is
Torque on a dipole kept in external electric field is given by the expression,
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