7. A dynamo coil rotates 4200 rotation per minute in a magnetic flux of flux density 0.05 Tesla. If the number of turns of the coil is 100 turns and the area of each of them is 25
cm?. Calculate:
A. The maximum value of the e. m.f.
B. Its effective value
C. The instantaneous value of the e. m.f. when the coil rotates 1/12 rotation from the
perpendicular plane

Can anyOne solve No. C ?

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?