Electrostatic Potential and Capacitance 9 The plates in a parallel plate capacitor are separated by a distance d with air as the medium between the plates In order to increase the capacity by 66 67 a dielectric slab of dielectric constant 5 is introduced between the plates What is the thickness of dielectric slab 1 3 Ala 94 5d 4 d 10 In the figure shown the equivalent capacitance between A and B is 10 F 10 F 3 A 1 3 75 F 3 6 5 F 2C 1 20 X 3C 5 HH 5 F 2 5 25 F 4 10 5 F 11 Equivalence capacitance between the points X and Y in the circuit is 2 1 100V 3 80 V 3 F B 0 b JIN 15 F HH 6 F 6uF N 5C 3 A a 0 Y 4 None of these 12 A capacitance of 10 uF is charged to a potential of 50V with a battery The battery is now disconnected and an additional charge 200 C is given to positive plate of the capacitor The potential difference across the capacitor become B 2 70 V 4 60 V 13 A charge q is placed at the origin O of X Y axes as shown in the figure The work done by external agent in taking a charge Q from A to B along the curved line A B is 3 Qq a l 4TE ab 3 Qq b 4 TE a Q 4RE L 3ms L Telegram neelquestion n 2L 14 A charged Q is uniformly distributed over a thin rod AB of length L as shown in the figure The electric potential at the point O lying at distance 2L from the end A is 0 N W 2 4 en 3 2 4 Aakash Institute Qq b a 4 ab Qq 2m 4 3Q 4 L a Q 4xL 10 C b B 15 In the arrangement of two concentric conducting shell as shown in the figure charge on the outer shell is 10 C and the inner shell is grounded Then charge q on the inner shell is n WIN 1 Zero 3 q 20 C 16 2 q 10 C 4 q 5 C Two identical capacitors have the same capacitance C One of them is charged to potential V and other to V The negative end is joined with the positive end of other capacitor When the other two remaining ends are connected the change in energy of combined system is 1 C v v C V V 3 C V V 4 C V V