Question

Which instrument does not have a positive (+) and a negative (-) sign?

• A. In voltmeter
• B. In ammeter
• C. In electric cell
• D. In coil

Hint:

Only devices that measure or supply current/voltage need polarity marking.

Answer 1

The Correct Option is D

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 – sign.