A conducting loop has an area of 0.065 m2 and is positioned such that a uniform

Question

A conducting loop has an area of 0.065 m2 and is positioned such that a uniform magnetic field is perpendicular to the plane of the loop. When the magnitude of the magnetic field decreases to 0.30 T in 0.087 s, the average induced emf in the loop is 1.2 V. What is the initial value of the magnetic field?

A conducting loop has an area of 0.065 m2 and is positioned such that a uniform magnetic field is perpendicular to the plane of the loop. When the magnitude of the magnetic field decreases to 0.30 T in 0.087 s, the average induced emf in the loop is 1.2 V. What is the initial value of the magnetic field?

Explanation / Answer

Apply EMF = -N(Bf - Bi)A/t

1.2 = -(1)(.3 - Bi)(.065)/.087

Bi = 1.91 T

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