Q. The electric field strength in the capacitor shown in circuit below in steady state is . The distance between the plates of the capacitor is , square plates are of area , the resistance and the internal resistance of battery is .

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A

the emf of the battery is

B

the attractive force between the plates is (approx)

C

the charge on the plates is

D

the current through the battery in steady state is

Solution:

In steady state the potential difference across capacitor is given as

Current through the battery in steady state is given as

Potential difference across capacitor is given as

Current through battery is given by equation-(1) as .
Charge on capacitor plates is given as

Force between plates of capacitor is given as

Questions from Current Electricity

1. Two sources of equal emf are connected to an external resistance . The internal resistances of the two sources are and If the potential difference across the source having internal resistance , is zero, then :

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For which of these junctions, is the following equation correct ?

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