ui geu to 100V. The energy stored in the capacitor is l)1.I x 10-3 c) 2.2 x 103j

Question

ui geu to 100V. The energy stored in the capacitor is l)1.I x 10-3 c) 2.2 x 103j d)2.2 x 10%. 6. A parallel plate capacitor with a plate area of 0.8 m2 separated by a 0 mi ee (The dielectric constant of mica is 5.4). The capacitor is charged to 12 V. The energy stored in the capacitor is a) 0.046 mj. b) 0.32 j. d) 46 pj. c) 4.6 .J. 7. An | | resistor is connected across a battery of emf 6 V and internal resistance i . Find the power delivered to the external resistance. R:- a) 6W. c) 5V b)2.75 W. d)0.5W

Explanation / Answer

6)

area, A=0.8 m^2

separation, d=0.6 mm

dielectric constant, K=5.4

potential,V=12 v

use,

capacitance, C=k*eo*A/d

C=5.4(8.85*10^-12*0.8/(0.6*10^-3)

C=6.372*10^-8 F

and

Energy stored, U=1/2*C*V^2

=1/2*6.372*10^-8*12^2

=4.6*10^-6 J or 4.6 uJ --> option (c) is correct

7)

R=11 ohms

r=1 ohms

emf,V=6 v

use,

I=V/(r+R)

I=6/(1+11)

I=0.5 A

current in the circuit,I=0.5 A

power deliverd to the R is, P=I^2*R

P=0.5^2*11

P=2.75 W option (B) is correct

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