The figure shows a circuit consisting of an ideal battery withemf = 6 μV, a resistance R, and a small wire loop of area 5cm2. For the time interval t = 10 s to t = 20 s,an external magnetic field is set up throughout the loop. Thefield is uniform, its direction is into the page in the figure andthe field magnitude is given by B = at, where B is in teslas, a isa constant and t is in seconds. The other figure given thecirrent i in the circuit before, during and after the external fiedis set up. The vertical axis scale is set by is =2 mA. Find the constant a in the equation for the fieldmagnitude. Excuse the drawings... I'm new tothis...
Figurea                                                i(mA)    
                                                                           0                  t(s)                           30


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