Part A Express your answer numerically in volts to three significant figures Par
ID: 1288918 • Letter: P
Question
Part A
Express your answer numerically in volts to three significant figures
Part B
Find the direction of the induced current in the loop as viewed looking along the direction of the magnetic field.
clockwise counterclockwise Shrinking Loop. A circular loop of flexible iron wire has an initial circumference of 166cm s has passed since the circumference of the loop started to decrease. Express your answer numerically in volts to three significant figures Part B Find the direction of the induced current in the loop as viewed looking along the direction of the magnetic field. clockwise counterclockwise EMF induced in the loop after exactly time 5.00s T , which is oriented perpendicular to the plane of the loop. Assume that you are facing the loop and that the magnetic field points into the loop. Part A Find the magnitude of the emf E cm/s due to a tangential pull on the wire. The loop is in a constant uniform magnetic field of magnitude 0.600T cm , but its circumference is decreasing at a constant rate of 13.0cm/sExplanation / Answer
Radius Initially = 166 / 2 x 3.14 = 26.42 cm/s
rate of decrease of radius = 13 / 2 x 3.14 = 2.07 cm/s = dr/dt
E = d?/dt
= B x dA/dt
A = ?r2
dA/dt = 2 ? r (dr/dt)
r at five seconds = 26.42 - 5 x 2.07 = 16.07
E = 0.6 x 2 x 3.14 x (16.07 x 10-2) x (2.07 x 10-2) = 0.0125 V
Direction : clockwise (by lenz's law)