Q. 9

# Two

The EMF of the equivalent Cell is The internal resistance of the equivalent cell is Given

The EMF of the two cells are given as and , the internal resistance of the two cells are given as and respectively and are connected in parallel.

Formula Used

To find the effective EMF and internal resistance we use the formula of Effective Parallel EMF which indicates if the resistance is attached in parallel to each other between two voltage, the effective EMF is equivalent to the EMF acted by the load resistance and for the internal resistance, the internal load resistance is the ratio of the product resistance by sum of the resistance. and where is the effective EMF, and are the EMF of the cells, and is the resistance of the cells, is the internal resistance.

The EMF of and = and resp.

The internal resistance and respectively

The EMF of the 2 cells connected in parallel is   and

The internal resistance is  Therefore, The EMF of the equivalent Cell is and the internal resistance of the equivalent cell is .

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