Q.

Capacitance of a capacitor made by a thin metal foil is 2μF . If the foil is folded with paper of thickness 0.15mm , dielectric constant of paper is 2.5 and width of paper is 400mm , then length of foil will be

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a

0.34 m

b

1.33 m

c

13.4 m

d

33.9 m

answer is D.

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Detailed Solution

If length of the foil is l then
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Capacitance of a capacitor made by a thin metal foil is 2μF . If the foil is folded with paper of thickness 0.15mm , dielectric constant of paper is 2.5 and width of paper is 400mm , then length of foil will be