Question:
A wire is connected to a battery between the points M and N as shown in figure
(1). The same wire is bent in the form of a square and then connected to the battery between the points M and N as shown in figure
(2). Which of the following quantities increases?
A wire is connected to a battery between the points M and N as shown in figure
(1). The same wire is bent in the form of a square and then connected to the battery between the points M and N as shown in figure
(2). Which of the following quantities increases?
Show Hint
Resistance of a wire is independent of its shape.
Heat produced increases if current increases.
Updated On: Mar 19, 2026
- Heat produced in the wire and resistance offered by the wire
- Resistance offered by the wire and current through the wire
- Heat produced in the wire, resistance offered by the wire and current through the wire
- Heat produced in the wire and current through the wire
Show Solution
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The Correct Option is D
Solution and Explanation
Step 1: Resistance of a wire depends only on its material, length and cross-sectional area: R = ρ (L)/(A) Bending the wire does not change its resistance.
Step 2: When the wire is bent into a square and connected across the same battery, the effective distance between terminals is reduced, leading to increased current due to lower potential drop per unit length.
Step 3: Since current increases and resistance remains constant, heat produced: H = I²Rt also increases.
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