Q. An electrical circuit is shown in figure-. The resistance of each voltmeter is infinite and each ammeter is . The charge on the capacitor of in steady sate is . Choose which of the following statements is/are correct regarding the given circuit :

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A

Reading of voltmeter is

B

Reading of ammeter is zero and is

C

Reading of voltmeter is

D

EMF of the ideal cell is

Solution:

In steady state current through branch of capacitor is zero.
Thus current flows through and and ammeter in series combination.
Potential difference across the capacitor is given as

This is also potential drop across resistance and ammeter in series of which the total resistance is .
This and resistances are in series so we use

Thus battery EMF is given as

Current through the battery 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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2. In the network shown in figure, each resistance is equal to . The resistance between the points and is

3. A letter ' ' is constructed from a uniform wire with resistance per The sides of the letter are and the cross piece in the middle is long. The apex angle is The resistance between the ends of the legs is

4. The diagrams show five different ways in which currents can combine at a junction.

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

5. A battery of emf, is connected to resistances as shown in figure. The potential difference between the points and is

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