Q. Three identical capacitors C1, C2 and C3 of capacitance 6 mF each are connected to a 12 V battery as shown. Find : (i) charge on each capacitor (ii) equivalent capacitance of the network (iii) energy stored in the network of capacitors
17. Three identical metallic plates A, B and C are initially given charges Q, 4Q and 2Q respectively. Now the plates A and C are connected by a conducting wire and plate B is earthed then.
(A) charge on the inner surface of plate A is 2Q.
(B) charge on the inner surface of plate C is zero.
(C) charge flown through the connecting wire from plate C to A is Q.
(D) charge flow to the plate B from ground is - 7Q.
Q. Three identical capacitors of capacitance 6 mF each are connected to a 12 V battery as shown. Find : (i) charge on each capacitor (ii) equivalent capacitance of the network (iii) energy stored in the network of capacitors
Do we use direct V=Ed
Q.26. Calculate the potential difference and the energy stored in capacitor C2 in the circuit shown in the figure. Given potential at A is 90 V, C1 = 20F, C2 = 30F and C3 = 15F.
[20 V, 6 mJ]
15. Three points A, B and C lie in a uniform electric field (E) of 5 x 103 N/C as shown in the figure. Find the potential difference between A and C. What is the work done in moving a 1mC charge from B to C?
[400V, W=0]
16. Two parallel plate conditions X and Y, have the same area of plates and same separation between them. X has air between the plates while Y contains a dietectric medium of K=4.
(i) Calculate capacitance of each capacitor if equivalent capacitance of the combination is 4 mF.
(ii) Calculate the potential difference between the plates of X and Y.
(iii) What is the ratio of electrostatic energy stored in X and Y ?
[Cx = 5mF Cy=20mF, Vx=2.4V, Vy=9.6V, Ux; Uy =4:1]