In Africa, there is grooved bedrock and there are glacial deposits called tillites that are more than 240 million years old. These are found along the equator, in areas with a

very warm climate. What could you infer from these rocks about the position of this part

of Africa in the past?

past?

Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?