Questions Name:-- resistance of 20 M and a time constant of 100 sec. If the what

Question

Questions Name:-- resistance of 20 M and a time constant of 100 sec. If the what is the charge in coulombs on its plates? charged to a voltage of 10v, A charged 1F capacitor is connected in parallel with a IMO connection is made will the capacitor voltage drop to a) 50% value? 1M2 resistor. How long after the , b) 10%, and c) 2% of its initial How many 1 F capacitors wou of 1 coulomb with a potential of 200 volts across the capa ld need to be connected in parallel in order to store a charge citors?

Explanation / Answer

Question 1) Given , R = 20 M = 20*10^6 ,

Time constant () = 100 s , voltage(V) = 10 V

For an RC circuit , time constant () = R*C

So,

100 = 20*10^6*C

C = 100/20*10^6

C = 5*10^-6 F

Now,

q = C*V

q = 5*10^-6*10

q = 50*10^-6 C = 50 C

Thus , the charge on the plates is 50*10^-6 C

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