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NEET Class neet Answered

If the current I through a cell having a driving force d and an internal resistance r is varied and its terminal voltage V is noted each time and a graph V → I is drawn, then the slope of this graph and the intercept on the V axis are and respectively.
Asked by riyachabhadiya5 | 03 Jan, 2024, 02:49: PM
answered-by-expert Expert Answer

Figure shows a cell that has EMF E and internal resistance r is connected to rheostat through switch and Ammeter.

When switch is open there is no current flow in the circuit and the meaured voltage across terminals a nd B of cell equals to EMF E .

After closing the switch , voltage across the terminals a and b is measured by varying the current using Rheostat .

Terminal voltage is 

img

As current increases , terminal voltage decreases because there is voltage across internal resistance .

It can be seen that voltage decreases linearly with increasing current .

The slope of the graph is internal resistance of cell .  Y-intercept is voltage when current is zero .

Hence Y-intercept is internal resistance of cell .

 

 

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