Assertion :Voltmeter is much better than a potentiometer for measuring emf of cell. Reason: A potentiometer draws no current while measuring emf of a cell.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is correct but Reason is incorrect

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is incorrect but Reason is correct

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D Assertion is incorrect but Reason is correct
Potentiometer is preferred for measurement of emf of cell. Potentiometer draws no current from cell while voltmeter draws some current, therefore emf measured by voltmeter is slightly less than actual value of emf of cell. Further the potentiometer is used with a galvanometer which is set to null reading when the experiment is performed. The method of null reading avoids many errors.

Suggest Corrections

Similar questions

H_{2}

H e

(1 + \frac{P b}{R T})

H_{2}

H e

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

{2n}^{2}

Join BYJU'S Learning Program