I'm preparing for an exam by solving the sample questions , here is the one I'm having difficulty with :
Following is the given circuit.
Which contains two resistance R1 and R2 in form of circle of radius r=1m with a battery having e.m.f. V=10π volt.
Upper resistance is having resistivity p1=4 & lower resistance having resistivity p2=2.
Angle between two points A and B is 60°. (wires have same cross section A_1 = A_2 = 2 cm^2)
Diagram :
Here is the question based on this passage that I'm having difficulty with :
Find magnitude of magnetic field at center.
(A) 0T (B) 1T (C) 2T (D) πT
The problem is I don't know any formula to calculate the magnetic field at a point nor am I expected to know (probably , at least it is not in syllabus) .
Also what is 'T' ? Is it unit of magnetic field?
The answer is 0 so I guess I should be able to reason why it should be 0 but I don't know how. Please help.
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