Electricity and Magnetism Answers

Describe how switching the drsk lamp on and off shows that light waves transfer energy

A coil of wire with 50 turns and 10 cm diameter is placed perpendicularly to a uniform magnetic field of 0.03 T. Calculate the induced e.m.f. if the coil is flipped 60 degree in 30 ms. The coil is connected to an electrical instrument that has resistance of 35 ohm. Calculate the induced current flows in the coil.

Could the electron beam in an oscilloscope tube (cathode-ray tube) be used as a compass? How? What advantages and disadvantages would it have in comparison with a conventional compass?

Can the following quantities be measured or calculated for light waves and subatomic particles, why or why not ?

Momentum:
Velocity:
Frequency:
Energy:

I don't understand this question and need help
Thanks

if you used nichrome wire .4m in length, and .02 cm in diameter, to make a small solenoid. and if you used a 1.4 v battery, what would be the direction and magnitude of the magnetic field at the centre of this solenoid?

you and a few friends were to charge up your hair by rubbing a balloon against your head, you could run in a circle and create a current. What is the magnitude and the direction of the magnetic field that would be created in the middle of this circle?

What do you mean when we say that the atom is existed?

A heat pump is used to meet the heating requirements of a house and
maintain it at 20°C. On a day when the outdoor air temperature drops to
-2°C, the house is estimated to lose heat at a rate of 80,000 kJ/h. If the
heat pump under these conditions has a COP of 2.5, determine (a) the
power consumed by the heat pump and (b) the rate at which heat is
absorbed from th

If you hooked a battery up to a cylinder of water, what current would flow if it was sea water, and what current would flow if it was tap water?

Calculate a rough estimate of the magnitude and direction of the electric field near one of your earlobes produced by the electrons in both eyes. You can assume the charge from the electrons acts like it is all in the centre of each eyeball