A coil has N turns enclosing an area of A. In a physics laboratory experiment, the coil is rotated during the time interval t from a position in which the plane of each turn is perpendicular to Earth's magnetic field to one in which the plane of each turn is parallel to the field. The magnitude of Earth's magnetic field at the lab location is B. What is the magnitude of the average emf induced in the entire coil

b) 10 minutes

girls stopped for 10 minutes.

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.