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Thursday, 28 November 2013

Q.No.13.7: - Describe a circuit which will give a continuously varying potential?

Q.No.13.7: - Describe a circuit which will give a continuously varying potential?
Ans: - A potential divider or potentiometer is a circuit which can give a continuously varying potential. Consider a resistance R in the form of a wire on which a terminal C can slide. The resistance between A and C can be varied from 0 to R, as C slides from A to B.
          If we connect a battery of emf E across a resistance R. The current flowing thought it is
                                                  I        =        E/R
If we represent the resistance between A and C by r, the potential drop between these points will be
                                                  V        =        rI
Now,
                                                  V        =        r x E/R

Thus as C slides from A to B, r varies from 0 to R, and the potential drop between A and C changes from zero to E. This arrangement by which potential can be varied continuously from 0 to E is known as a potential divider.   (Sorry for Diagram. Pleas concert with Text Book for diagram.)

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