Fig. 28-4 shows three long, parallel, current-carrying wires. the current directions are indicated for currents i1 and i3. the arrow labeled f represents the magnetic force acting on current i3. the 3 currents have equal magnitudes. what is the direction of the current i2?

Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. half way betwween the two plates the electric field has magnitude e. if the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates?

Amanometer is used to measure the air pressure in a tank. the fluid used has a specific gravity of 1.25, and the differential height between the two arms of the manometer is 34 in. if the local atmospheric pressure is 12.7 psia, determine the absolute pressure in the tank for the cases of the

What happens in a global convection cell