The magnetic field perpendicular to a circular wire loop12.0cm in diameter is ch
ID: 1743013 • Letter: T
Question
The magnetic field perpendicular to a circular wire loop12.0cm in diameter is changed from +0.52T to -0.45 T in 180 ms,where + means the field points away from an observer and - towardthe observer. (A) calculate the induced emf. (B) in what directiondoest the induced current flow ******I UNDERSTAND HOW TO DO THE PROBLEMBUT I DO NOT UNDERSTAND..PART B..WHAT MAKES IT CLOCKWISE..CAN UEXPLAIN IN DETAIL PLEASE..THANK YOU The magnetic field perpendicular to a circular wire loop12.0cm in diameter is changed from +0.52T to -0.45 T in 180 ms,where + means the field points away from an observer and - towardthe observer. (A) calculate the induced emf. (B) in what directiondoest the induced current flow ******I UNDERSTAND HOW TO DO THE PROBLEMBUT I DO NOT UNDERSTAND..PART B..WHAT MAKES IT CLOCKWISE..CAN UEXPLAIN IN DETAIL PLEASE..THANK YOUExplanation / Answer
a. inducedEMF E = -d/dt = - A *B/t here change in magneticfield B = -0.45 - ( + 0.52) = -0.97 T area ofloop A = * r2 = 3.14 *0.122 = 0.0452 m2 E = -0.0452 * ( - 0.97) / 180 *10-3 = 0.244 V = 244 mV b. Using conventionalmethod, positive value of EMF will induce a clockwisecurrent. also youcan say that field is increasing towards observer ( observeris facing a stronger N pole) hence the direction of current will besuch that to weaken this effect, and henceclockwise. E = -0.0452 * ( - 0.97) / 180 *10-3 = 0.244 V = 244 mV b. Using conventionalmethod, positive value of EMF will induce a clockwisecurrent. also youcan say that field is increasing towards observer ( observeris facing a stronger N pole) hence the direction of current will besuch that to weaken this effect, and henceclockwise.Related Questions
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