Q Search 15 pts 3. The north end of a bar magnet is pushed downward toward a coi

Question

Q Search 15 pts 3. The north end of a bar magnet is pushed downward toward a coil of wire in the plane of the paper. The coil area is 20 cm2. The field perpendicular to the plane of the coil has an initial value of 0.045 T which increases to 0.085 T in 0.150s 3pts. a. What is the initial flux through the coil? 3pts. b. What is the final flux through the coil? 3pts.c. What is induced Emf if there are 250 turns? 3pts. d. In which direction is the induced current (clockwise or counterclockwise)? 3pts. e. What is the direction of the magnetic field due to the induced current? P11 3

Explanation / Answer

a) Initial flux through the loop = A*B1

= 20*10^-4*0.045

= 9.0*10^-5 T.m^2 or weber

b) Final flux through the loop = A*B2

= 20*10^-4*0.085

= 1.7*10^-4 T.m^2 or weber

c) Induced emf = N*change in magnetic flux/time taken

= 250*(1.7*10^-4 - 9*10^-5)/0.15

= 0.133 V

d) counter clockwsie

e) perpendicularly out of the paper

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