Explain how you would use the equipment below to teach a primary school student that electrical charges do not originate in the battery.
battery
wwch
light bulb

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)

What is the state of matter with a specific volume but no definite shape