A steel railroad track has a length of 23 m when the temperature is 0°C.
What is the increase in the length of the
rail on a hot day when the temperature is
34°C? The linear expansion coefficient of
steel is 11 x 10-6 (°C)-1.
Answer in units of m.

small = small current large mag large current

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.