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Discussion Response Post to: electrostats

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21 Feb 2007 19:38:47 IST

Subject: Re:electrostats

raman_1290 (96)

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initially, E = (1/2) q²/C

for increased charge,q' = q + 2, energy stored ,E' = 1.21 E

E' = (1/2) (q+2)²/C

= (1/2) q²/C + (1/2) (4q + 4)/C

or 1.21 E = E + (2q+2)/C

or (2q+2)/C = 0.21 E

i.e. (2q+2)/C = (0.21) (1/2) q²/C

or 2q+2 = (21/200)q²

or 21q² - 400q - 400 = 0

(21q + 20)(q - 20) = 0

hence, q = 20C or q = -20/21C

challenges are what makes a person .......
never hesitate in accepting them, after all LIFE is also a big challange.

this reply: 7 points (with 1 Olaaa!! Perrrfect answer.

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