The unknown emf Ex, can be found by using potentiometer by formula
Correct answer: D. Both (b) and (c)
- A. Ex = R/r x E
- B. Ex = E r/R
- C. Ex = I/L x E
- D. Both (b) and (c)
Explanation
Option (b) Ex = E r/R involves using the balancing length (r) and the total length of the potentiometer wire (R) to find the unknown emf (Ex). This is a common method in potentiometer experiments.- Option (c) Ex = I/L × E involves measuring the current (I) flowing through the potentiometer wire and relating it to the known emf (E) to determine the unknown emf (Ex). This method may be used in certain potentiometer setups.Both options (b) and (c) represent valid approaches for finding the unknown emf in potentiometer experiments, depending on the specific setup and measurements taken
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About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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