Chapter 2 – Capacitance
The capacitance of a parallel plate capacitor is C0 when the space between the plate is vacuum. Now this space is filled by a slab of dielectric constant K. The capacitor is connected to a battery emf V and the slab is taken out. (A) Charge (K1)C0V flow through the battery (B) Energy (K−1)C0V^2 is absorbed by the cell (c) The external agent has to do 1/2(K−1)C0V^2 amount of work to take the slab out (D) the heat produced in connecting wires is 1/2(K−1)C0V^2
30
Nov
The capacitance of a parallel plate capacitor is C0 when the space between the plate is vacuum. Now this space is filled by a slab of dielectric constant K. The capacitor is connected to a battery emf V and the slab is taken out. (A) Charge (K1)C0V flow through the battery (B) Energy (K−1)C0V^2 is [...]
A parallel plate capacitor is connected to a cell. A metal plate of negligible thickness is inserted parallel to plates. (A) the capacitance remains same (B) the cell will supply more charge (c) Equal and opposite charges will appear pm two faces of metal plate (D) the potential difference between the plates will increase
30
Nov
A parallel plate capacitor is connected to a cell. A metal plate of negligible thickness is inserted parallel to plates. (A) the capacitance remains same (B) the cell will supply more charge (c) Equal and opposite charges will appear pm two faces of metal plate (D) the potential difference between the plates will increase Minimum [...]
An uncharged capacitor is connected to a battery. On charging the capacitor a. All the energy supplied is stored in the capacitor b. Half the energy supplied is stored in the capacitor
30
Nov
An uncharged capacitor is connected to a battery. On charging the capacitor a. All the energy supplied is stored in the capacitor b. Half the energy supplied is stored in the capacitor An uncharged capacitor is connected to a battery. On charging the capacitor a. All the energy supplied is stored in the capacitor b. [...]
A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be
30
Nov
A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be Minimum number of capacitors of 4μF capacitance each required to obtain [...]
1000 small water drops each of radius r and charge q coalesce together to form one spherical drop. (A) the ratio of capacitances of big and small drop is 10 (B) the ratio of potential of big and small drop is 100 (c) the ratio of surface charge densities of big and small drop is 10 (D) the ratio of energy stored of big and small drop is 10^5
30
Nov
1000 small water drops each of radius r and charge q coalesce together to form one spherical drop. (A) the ratio of capacitances of big and small drop is 10 (B) the ratio of potential of big and small drop is 100 (c) the ratio of surface charge densities of big and small drop is [...]
Two capacitors C1 and C2 in a circuit are joined as shown. If VA = V1, VB = V2, the potential of point P is
30
Nov
Two capacitors C1 and C2 in a circuit are joined as shown. If VA = V1, VB = V2, the potential of point P is the potential of point P is Two capacitors C1 and C2 in a circuit are joined as shown. If VA = V1 VB = V2 November 30, 2020 Category: Cengage [...]
In the given circuit if point C is connected to the earth and a potential of +80V is given to the point A, the potential at B is
30
Nov
In the given circuit if point C is connected to the earth and a potential of +80V is given to the point A, the potential at B is In the given circuit if point C is connected to the earth and a potential of +80V is given to the point A the potential at B [...]
Three capacitors of capacitances 3μF,9μF and 18μF are connected in series across a 120V supply line. The Charged capacitors are then disconnected from the line and reconnected with plates of same polarities together and no-external voltage. the charge on 3μF is
30
Nov
Three capacitors of capacitances 3μF,9μF and 18μF are connected in series across a 120V supply line. The Charged capacitors are then disconnected from the line and reconnected with plates of same polarities together and no-external voltage. the charge on 3μF is Minimum number of capacitors of 4μF capacitance each required to obtain a capacitor of [...]
Two capacitor of capacitance 5μF and 10μF are charged to potential 40V and 10V respectively. Now the two capacitors ate connected with plates of same polarities together . (A) the common potential will be 20V (B) the final charges of capacitors will be 100μC and 200μC (c) the ratio of total energy stored in capacitors before and after connection is 3:2 (D) the loss energy of system is 1500μJ
30
Nov
Two capacitor of capacitance 5μF and 10μF are charged to potential 40V and 10V respectively. Now the two capacitors ate connected with plates of same polarities together . (A) the common potential will be 20V (B) the final charges of capacitors will be 100μC and 200μC (c) the ratio of total energy stored in capacitors [...]
Two capacitors of capacitances 3μF and 6μF are charged to a potential of 12V each. They are now connected to each other, with the positive plate of each joined to the negative plate of the other.
30
Nov
Two capacitors of capacitances 3μF and 6μF are charged to a potential of 12V each. They are now connected to each other, with the positive plate of each joined to the negative plate of the other. Two capacitors of capacitances 3μF and 6μF are charged to a potential of 12V each. They are now connected [...]