Question 16: Current Electricity

Question

Assertion : A potentiometer is preferred over that of a voltmeter for measurement of emf of a cell.
Reason : Potentiometer does not draw any current from the cell.

Accepted Answer

When a voltmeter is connected across the two terminals of a cell, it draws a small current from the cell, so it measures terminal potential difference between the two terminals of the cell, which is always less than the emf of the cell on the other hand, when a potentiometer is used for the measurement of emf of cell, it does not draw any current from the cell. Hence, it accurately measures the emf of cell. Thus, a potentiometer is preferred over a voltmeter.

Answer

Both assertion and reason are true and reason is the correct explanation of assertion

Answer

Both assertion and reason are true but reason is not the correct explanation of assertion

Answer

Assertion is true but reason is false

Answer

Both assertion and reason are false.

Current Electricity

Assertion : A potentiometer is preferred over that of a voltmeter for measurement of emf of a cell. Reason : Potentiometer does not draw any current from the cell.

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