# Circular Loop in Magnetic Field... please help last try:/?

A circular loop lies with its plane normal to a magnetic field given by

B=(0.500 - 0.0400t) T, where t denotes the time in seconds. The induced emf in the loop is 2.26 V. Calculate the radius of the loop.

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- Steve4PhysicsLv 71 month agoFavorite Answer
B=(0.500 – 0.0400t) ⇒ dB/dt = -0.0400

Emf = -dΦ/dt = -d(BA)/dt = -AdB/dt

2.26 = -πr²(-0.0400)

r = √[2.26/(0.0400π)] = 4.24m

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