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12th West Bengal Board
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Five point charges, each of value +q coulomb, are placed on five vertices of a regular hexagon of side L metre. The magnitude of the force on the point charge of value -q coulomb placed at the center of the hexagon is q2kπε0L2 newton. Value of k is

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Important Questions on Interaction of Charged Particles, Electric Field and Potential

MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 1
The charges of two small spherical metallic conductors are +12 and +8 esu respectively. What will be the force between them if they are kept 8 cm apart? 
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 2
A point charge A of +25 esu is placed between two charges B and C on the same line with them. The amount of charges in B and C are +5 esu and -30 esu respectively. The distance between the charge A and B is 2.5 cm and between A and C is 5 cm. What force will act on the charge A ?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 3
Two equal and like charges repel each other with a force of 50mg wt when they are 19 cm apart in air. What is the magnitude of each charge?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 4
The mutual force of repulsion between two point charges at a fixed distance apart in 9 dyne when in vacuum, and 4 dyne when placed in a medium. What is the value of the dielectric constant of that medium?
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 5
Two point charges,+10μC and -10μC, are kept 10 cm apart. Find the electric field at a point on the perpendicular bisector of the line joining the charges, at a distance 12 cm from its middle point.
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 6
The potentials at two points in an electric field is 400 Volt and 1000 Volt respectively. What work must be done to move a positive charge of 3×10-8 coulomb from one of these points to the other?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 7
Two charges +20μC and +20μC are placed 2 cm apart. Find the potential due to the charges at the centre of the line joining the two charges.
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 8

The distance between two points A and B is 2d. At each of these two points a+Q charge is placed. P is the mid-point of A and B 

Find  the intensity.