A) Two point charges of values $q$ and $2q$ are kept at a distance d apart from each other in air. A third charge $Q$ has to be kept along the same line in such a way that the net force acting on q and $2q$ is zero. Calculate the position of charge $Q$ in terms of q and d. b)A capacitor of capacitance C is charged fully by connecting it to a battery of e.m.f ‘e’. It is then disconnected from the battery. If the separation from the plates of the capacitor is $b$ now doubled, what will be a) charge stored in the capacitor? b) potential difference across it c) field strength between the plates d) energy stored by the capacitor

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