The magnetic field perpendicular to a circular wire loop 66

The magnetic field perpendicular to a circular wire loop 6.6 cm m diameter is changed from +0 38 T to -0 25 T in 240 ms where + means the field points away from an observer and - toward the observer Calculate the induced emf. Express your answer using two significant figures In what direction does the induced current flow?

Solution

Induced emf, e = A * (dB / dt) = A * [ (B₂ - B₁) / dt]

Induced emf, e = pi * r² * (B₂ - B₁) / dt

= pi * 0.066² * (0.38 + 0.25) / 0.240

= 0.0359 V