Questions
The force of attraction between the plates of air filled capacitor having charge Q and area of each plate A is given by
a
Q22ε0A
b
Q2ε0A
c
Q2ε0A
d
Q2ε0A2
detailed solution
Correct option is A
Let x be the separation between the plates of the condenser. The energy stored in the capacitor is given by U=12CV2=ε0AV22x ∵C=ε0Ax ∴ dUdx=−ε0AV22x2So, F=−dUdx=ε0AV22x2 (1)Further, Q=CV=ε0AVxor V=Qxε0A ...(2)From eqs. (1) and (2), we getF=ε0A2x2×Qxε0A2=Q22ε0ATalk to our academic expert!
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Three point charges of equal value q are placed at the vertices of al equilateral triangle. The resulting lines of force should be sketch as in
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