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AB is a potentiometer wire as in figure....

AB is a potentiometer wire as in figure. If the value of R is increased, in which direction will the balance point J shift ?

Text Solution

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By increasing value of R current in main circuit will decrease hence p.d. across wire AB will decrease. Hence potential gradient (K) across two end of wire AB decreases.
At certain time for given cell null point chauges. Hence, potential gradient `(phi)` across AB decreases according to equation,
`E = phi I `
`therefore phi = (E)/(I)` ,
Thus, with increase in I, `phi` decreases. Thus, with increase in current (I) null point wi shift toward B.
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