Question

The figure shows a wire of resistance 40 Ω bent to form a circle and included in an electric circuit by connecting it from the opposite ends of a diameter of the circle. The current in the circuit is:

• A. 0.125 A
• B. 0.5 A
• C. 0.25 A
• D. 0.1 A

Answer 1

Answer:

B. 0.5 A

To find the current in the circuit, we need to understand the resistance of the wire and how it's affected by being bent into a circle.

Step 1: Understand the resistance of the wire

The wire has a resistance of 40 Ω.

Step 2: Determine the resistance of the circular wire

When the wire is bent into a circle, its resistance remains the same, 40 Ω, because resistance depends on the material, length, and cross-sectional area of the wire, not its shape.

Step 3: Analyze the circuit

The wire is connected to a power source, forming a complete circuit. Since we're not given the voltage of the power source, we can't directly calculate the current using Ohm's Law (I = V/R). However, we're given the current value as 0.5 A.

The final answer is: 0.5​