# Physics

posted by
**Anonymous**
.

A battery with EMF 6.0 Volts and internal resistance 0.1 ohms

is connected by a long wire to a resistor R = 8.0 ohms. The

wire goes around a solenoid. The

solenoid has 4000 turns per meter and area 25 cm^2.

a) If the current in the solenoid is I = 200 Amps and is

constant, then what is the current through the 8 ohm resistor?

b) If the current in the solenoid is I(t) = 200 cos(120(pi)t),

then what is the maximum current through the 8 n resisĀ

tor?

c) Is the battery ever being charged when the current in

the solenoid is I(t) = 200cos(120(pi)t)?