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
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Current Electricity questions
A voltmeter can read the correct potential difference only when the current drawn by it from the cellis
Kirchhoff's second rule is a manifestation of law of conservation of
Kirchhoff's first rule is a manifestation of law of enervation of
The electrode connected with positive terminal of battery is called
The electrode connected with negative terminal of battery is called
The resistance of a conductor through which a current of one ampere is flowing when a potential difference across its ends is one volt is