Two coils have mutual inductance m = 3.25×10−4h. the current i1 in the first coil increases at a uniform rate of 830 a/s. a) what is the magnitude of the induced emf in the second coil? is it constant? b) suppose that the current described is in the second coil rather than the first. what is the magnitude of the induced emf in the first coil?

If a balloon is taken outside on a very cold day, what will occur?

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.