For comparing the e.m.f.'s of two cells with | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) In a potentiometer circuit,the potential drop across the potentiometer wire must be greater than the $e.m.f.$ of the cells being compared. If the

Vedclass · Accepted Answer

The $e.m.f.$ of the standard cell is smaller than the $e.m.f.$'s of the two cells.

Vedclass · Answer

(D) In a potentiometer circuit,the potential drop across the potentiometer wire must be greater than the $e.m.f.$ of the cells being compared. If the $e.m.f.$ of the standard cell (which determines the potential gradient) is smaller than the $e.m.f.$ of the experimental cells,the potential drop across the wire will be insufficient to balance the $e.m.f.$ of the test cells. Consequently,no balance point (null point) will be obtained on the potentiometer wire,making the experiment unsuccessful. Therefore,option $D$ is the correct answer.

For comparing the $e.m.f.$'s of two cells with a potentiometer,a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful?

Similar Questions

$A$ wire,$10 \ m$ long,has a resistance of $40 \ \Omega$. It is connected in series with a resistance box of resistance $R$ and a $2 \ V$ storage cell. If the potential gradient along the wire is $0.1 \ mV/cm$,then the value of $R$ is (in $Omega$)

$A$ potentiometer balances at $44 \ cm$ when a cell of internal resistance $1 \ \Omega$ is in the secondary circuit. To obtain the balancing point at $40 \ cm$,the resistance to be connected in parallel to the cell is: (in $Omega$)

$A$ galvanometer can be used as a voltmeter by connecting a

In the potentiometer experiment shown in the figure,for the position $X$ of the jockey $J$,there occurs a null deflection in the galvanometer. Then the potential difference between points $A$ and $X$ is ................ $V$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module