InterviewSolution
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InterviewSolution
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A circular coil of radius `R` carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance `r` from the centre of the coil, such that `r gtgt R`, varies asA. `(1)/(r)`B. `(1)/(r^(3))`C. `(1)/(r^(2))`D. `(1)/(r^(3//2))` |
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Answer» Correct Answer - B The magnetic field due to a cicular coil of radius `R` at a point on the axis of the coil located at a distance `r` from the centre of the coil, `B = (mu_(0))/(4pi) (2pi I R^(2))/((R^(2) + r^(2))^(3//2))` Given `r gtgt R` then we have, after neglecting `R`, `B = (mu_(0))/(4pi) (2pi i R^(2))/(r^(3))` Also area `= pi R^(2)` |
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