2 Four condensers are joined as shown in the adjoining

A parallel plate capacitor has a charge magnitude of 80 nC on either plate a plate separation of 0 50 mm and a uniform electric field of magnitude 3000 volts m What is the potential energy stored in the capacitor O a 40 n Ob 30 nj O 60 nj Od 70 nj 0 50 nj

2 Let C be the capacitance of a capacitor discharging through a resistor R Suppose t is the time taken for the energy stored in the capacitor to reduce to half its initial value and t2 is the time taken for the charge to reduce to one fourth its initial value Then the ratio will be

30 The switch S shown in figure 32 E35 is kept closed for a long time and is then opened at t 0 Find the current in the middle 10 Q2 resistor at t 1 0 ms 12 VI 25 25 F www 10 Q 10 22 Figure 22 1725

Two identical metal plates are given positive charges and 92 9 respectively If they are now brought close together to form a parallel plate capacitor with capacitance C the potential difference between them is A 91 92 2C B 91 92 C C 91 92 G 00 D 91 92 20 One plate of a capacitor of capacitance 2uF has total charge 10 Cand its other plate has t charge 40 C The potential difference between the plates is in Volt A 7 5 B 15 C 25 D 50

1 K K t ngure 31 12 Figure 31 E30 plates of the capacitor have plate area A and are clamped in the laboratory The dielectric slab is released from rest with a length a inside the capacitor Neglecting any effect of friction or gravity show that the slab will execute periodic motion and find its time period K I 1 1 The 1

Three large conducting plates are placed a distance d apart in air The space between the first two plates is completely filled with a dielectric slab of dielec tric constant K 2 as shown in Figure The plates are given charges Q 7Q Q2 3Q and Q3 2Q respectively The outer two plates are now connected with a conducting wire Find the charges on all the six surfaces d d

The potential at point P is k V V d A C kV 2V k 2 B D kV V K 1 kV 2V k 2 V 2d K P

In the given arrangement the charge on the 3 F capacitor is 2 F HE T 10V 3 F the fur HH 1 F

Find the equivalent capacitance of the combination shown in Fig 2 85 between the points A and B 10 5 9 Cs HH SI C Ans C B 2G G G G

A conducting sphere of radius R carrying charge Q lies inside an uncharged conducting shell of radius 2R If they are joined by a metal wire A Q 3 amount of charge will flow from the sphere to the shell B 2Q 3 amount of charge will flow from the sphere to the shell C Q amount of charge will flow from the sphere to the shell kQ D amount of heat will be produced 4R