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What is the total capacitance when two c...

What is the total capacitance when two capacitors C1 and C2 are connected in series?
a) (C1+C2)/C1C2
b) 1/C1+1/C2
c) C1C2/(C1+C2)
d) C1+C2

Text Solution

Verified by Experts

The correct Answer is:
D
consider the motion of ball from A to B.`Brarr ` just above the sand (just to penetrate) `u=0, a=9.8 m/s^2
S=5m`
From `S= ut+1/2at^2
rarr 5=0+1/2(9.8)t^2
rarr t^2=5/4.9= 1.02
rarr t= 1.01
:. Velocity at B
v'= u+at
= 9.8xx1.01=9.89m/s`
……..[Since u=0], Form motion of ball in sand
`u_1 = 9.89 m/s
v_1 =0
S=10 cm = 0.1 m.
S_2 =(v_1^2-u_1^2)/(2a)
S_2 =(v_1^2-u_1^2)/(2a)
=(0-(9.89)^2)/(2xx0.1)=-490m/s^2`
Hence retardation is sand is 490 m/s^2.
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