Question:
Which instrument does not have a positive (+) and a negative (-) sign?
Which instrument does not have a positive (+) and a negative (-) sign?
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Only devices that measure or supply current/voltage need polarity marking.
Updated On: Oct 27, 2025
- In voltmeter
- In ammeter
- In electric cell
- In coil
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The Correct Option is D
Solution and Explanation
Step 1: Explanation.
Voltmeter and ammeter have polarity signs; electric cell has positive and negative terminals.
Step 2: Note.
A coil is just a wire wound in loops, without polarity signs.
Step 3: Conclusion.
Thus, coil has no + or β sign.
Voltmeter and ammeter have polarity signs; electric cell has positive and negative terminals.
Step 2: Note.
A coil is just a wire wound in loops, without polarity signs.
Step 3: Conclusion.
Thus, coil has no + or β sign.
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