Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETPhysicsCurrent Electricity

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): When two cells of unequal emfs are connected in a closed series loop with their positive terminals joined together, the terminal potential difference across the weaker cell is strictly greater than its emf. Reason (R): In this arrangement, the weaker cell acts as a source of energy and discharges,

Options

  1. ABoth Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  2. BBoth Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
  3. CAssertion is correct but Reason is incorrect.
  4. DAssertion is incorrect but Reason is correct.

Correct answer

C. Assertion is correct but Reason is incorrect.

Step-by-step solution

When two cells of unequal emfs are connected with their positive terminals joined together, they oppose each other. The net emf in the loop is the difference of their emfs, and the stronger cell determines the direction of the current. The stronger cell discharges, pushing current out of its positive terminal. This current enters the positive terminal of the weaker cell. Therefore, inside the weaker cell, the current flows from the positive terminal to the negative terminal. This means the weaker cell is undergoing

Practice Current Electricity on Quantrex Academy →

More from Current Electricity

A potentiometer wire of 400 cm length has a resistance of 20 . It is connected in series with a resistance of 15 and a accumulator of EMF 6 V (negligible internal resistance). The 2026In the following figure current I equal to 2026The range of voltmeter is 10 V and its resistance is 50 . To convert it to a voltmeter of range 15 V , how much resistance is to be added? 2026When a galvanometer is shunted with a 2 resistance, the deflection is reduced to one-fourth. If the galvanometer is further shunted with a 1 resistance, the further reduction in de 2026A galvanometer can be converted into a voltmeter of certain range by connecting a resistance of 990 in series with it. When the resistance of 480 is connected in series, the range 2026A resistance is to be measured using a meter bridge; the student chooses the standard resistance R to be 100 . The student finds the null point at l₁=16 cm. To get the null point n 2026Which of the following statements is FALSE? A. In a balanced Wheatstone bridge, if the cell and the galvanometer are exchanged, the null point is disturbed. B. A rheostat can be us 2026A potentiometer wire has length 4 m and resistance 8 . The resistance that must be connected in series with the wire and the driving battery of e.m.f. 2 V, so as to get a potential 2026 Full Current Electricity list All NEET PYQs