Voltmeter is ideal and two aluminum foil is given at certain separation. In this set up upper aluminum foil jumps to the lower Al foil at the potential difference between the plates (or foils) of 500 V.
(i) When emf ε of the battery is 400 volt and foil has not jumped, approximate reading of the voltmeter is–
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Ans.
(i)
Sol. Before the foil jump circuit is disconnected, so reading of voltmeter is zero.
(ii)
Sol.
After the foil jumps 
will read ε – ir
Reading will be less than ε i.e. 500 V
(iii)
Sol. EMF will not change i.e. it is 500 V
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