A cell is connected between 2 points of a uniformly thick circular conductor.The magnetic field at the center of the loop is
a 0
b m0/2a *i1-i2
​c ​m0/2a *i1+i2
d ​m0/a *i1-i2

Dear Student,

your question seems to be incomplete as the option were different form yor question .
you have not given the detail about the wire how we can assume the current .
let the cuurent be I in the conductor average current .

field at the center from the loop law B=μ0I2a  where a is the radius of the loop Regards

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