Questions

Axis of a solid cylinder of infinite length and radius R lies along y-axis. It carries a uniformly distributed current I along +y direction. Magnetic field at a point (R/2, y, R/2) is

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μ0I4πR(i^-k^)

μ0I2πR(j^-k^)

μ0I4πRj^

μ0I4πR(i^+k^)

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detailed solution

Correct option is A

r=R2,B=μ0I(R/2)2πR2=μ0I22πRB→=Bcos45°i^+sin45°(-k^)=μ0I4πR[i^-k^]

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