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Test: Electric Dipole


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Test: Electric Dipole - Question 1

Which of the following molecule has permanent dipole moment?​

Detailed Solution for Test: Electric Dipole - Question 1

Ionic behavior implies dipole moment.

HCl is an ionic compound (H+Cl-)
CO2, CH4 and BF3  is a covalent compound

Test: Electric Dipole - Question 2

A dipole is said to be in stable equilibrium when angle between electric field and dipole moment is:​

Detailed Solution for Test: Electric Dipole - Question 2

Stable equilibrium is attained when potential energy of the dipole system is minimum which is possible at an inclination of 0°.

Test: Electric Dipole - Question 3

What is the angle between the electric dipole moment and the electric field on the equatorial line of the dipole?

Detailed Solution for Test: Electric Dipole - Question 3

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°.

Test: Electric Dipole - Question 4

An electric dipole is 

Detailed Solution for Test: Electric Dipole - Question 4

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.

Test: Electric Dipole - Question 5

How does electric field strength change with distance from a short dipole?

Detailed Solution for Test: Electric Dipole - Question 5

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

Test: Electric Dipole - Question 6

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

Detailed Solution for Test: Electric Dipole - Question 6

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.

Test: Electric Dipole - Question 7

Which of the following quantity is a scalar?

Detailed Solution for Test: Electric Dipole - Question 7

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.

Test: Electric Dipole - Question 8

For forming an electric dipole between two point charges separated by a small distance, the two point charges are of

Detailed Solution for Test: Electric Dipole - Question 8

By definition of Electric Dipole

Test: Electric Dipole - Question 9

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 

Detailed Solution for Test: Electric Dipole - Question 9

+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

Test: Electric Dipole - Question 10

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

Detailed Solution for Test: Electric Dipole - Question 10

Torque on a dipole kept in external electric field is given by the expression,

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