EASY
12th West Bengal Board
IMPORTANT
Earn 100

Define dielectric constant in terms of the capa-citance of a capacitor.

Important Questions on Capacitance and Capacitors

EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 22
Explain why the dielectric constant of a conductor is infinite.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 1
Calculate the energy of a charged conductor of capacitance C raised to a potential V. How does this energy depend on charge on the conductor?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 2
Two spheres of radii r1 and r2 contain charges Q1 and Q2 are situated at a large distance from each other. Now they are joined together by a thin wire. Find surface charge densities of the two. Also find the loss of energy of the two.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 3
Deduce the capacitance of a parallel plate air capacitor. Explain what happens when a dielectric material fills up the space between the two plates? Find the capacitance in this condition.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 4
Deduce the capacitance an isolated conducting sphere. Then find the capacitance spherical capacitor consisting of two hollow concentric spheres of radii r1 and r2r1>r2. Now show that a conducting sphere may be regarded as a spherical capacitor where outer sphere is at infinity.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 5
Explain how a capacitor is charged by a cell. Calculate the energy of a charged capacitor. Show that only half of energy expended by a cell is stored up as electrostatic energy. What happens to the other half?
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 6
Considering the situation of a parallel plate capacitor, explain what happens when an insulating material is inserted into the space between the two plates of a parallel plate capacitor. What is polarisation of dielectric? Explain why polarisation of the dielectric increases the capacitance of the capacitor.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 7
Calculate the energy of charged parallel plate capacitor. Express the energy in terms of electric field. Now calculate the energy density. Can this result be generalised ?