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Find the magnetic flux density B when E is given by 3sin y i + 4cos z j + ex k.(a) ∫(4sin z i – ex j – 3cos y k)dt(b) -∫(4sin z i – ex j – 3cos y k)dt(c) ∫(4sin y i – ex j + 3cos y k)dt(d) -∫(4sin y i + ex j + 3cos y k)dtThis question was posed to me in a job interview.My question is from Magnetic Field Density in chapter Magnetostics of Electromagnetic Theory

Answer»

Right option is (b) -∫(4sin z i – ex J – 3cos y k)dt

The explanation is: We know that Curl (E) = -dB/dt. The curl of E is (4sin z i – ex j – 3cos y k). To GET B, integrate the -curl(E) with respect to TIME to get B = -∫(4sin z i – ex j – 3cos y k)dt.


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