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  4. In the circuit shown in figure-3.349, the potential difference across the capacitor is 10 V. Each resistance is of 3 Ω. The cell is ideal. The EMF of the cell is :

Q. In the circuit shown in figure-, the potential difference across the capacitor is . Each resistance is of . The cell is ideal. The EMF of the cell is :

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Solution:

In the circuit shown in figure if a current is supplied by the battery then it is divided in resistances and in parallel as shown.

In steady state no current will flow through the branch of capacitor so equivalent resistance across the battery is given as

Thus current through battery is given as

In above circuit writing KVL equation from terminal to of capacitor gives


Substituting value of current in above equation, we get

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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