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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Experimental Physics

NTA Abhyas 2020 · Physics · Experimental Physics

In an experiment on measurements of emf of a cell by a...

In an experiment on measurements of emf of a cell by a potentiometer, the balancing length for a cell of emf EE and internal resistance rr is found to be ll. Now if another cell of emf EE and internal resistance 2r2r is connected in parallel to the first cell and balancing length determined, then the balancing length will be-

Options

  1. All
  2. B2l2l
  3. Cl2\dfrac{l}{2}
  4. D2l3\dfrac{2l}{3}

Correct answer

A. ll

Step-by-step solution

Since potentiometer doesn't draw any current to measure the emf of the cell, the balancing length will remain the same.

balancing length =l= l
&
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