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**1. Homework Statement**

In the ATTACHMENT is the given circuit. Which contains two resistance

R1 and R2 in form of circle of radius r = 1 m with a battery

having e.m.f. V = 10∏ volt. Upper resistance is having

resistivity = 4Ω-m & lower resistance having resistivity =

2Ω-m. Angle between two points A and B is 60°. (wires have

same cross section A1 = A2 = 2 cm2)

Find magnitude of magnetic field at centre.

**The attempt at a solution**

I tried it using the formula B = μiθ/4∏r. BUT THE ANSWER IS NOT COMING CORRECT.