Which of the following is true about electric currents and magnets?
A.
An electric current can exert a force on a magnet, and a magnet can exert a force on an electric current.

B.
An electric current cannot exert a force on a magnet, and a magnet cannot exert a force on an electric current.

C.
An electric current cannot exert a force on a magnet, but a magnet can exert a force on an electric current.

D.
An electric current can exert a force on a magnet, but a magnet cannot exert a force on an electric current.

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

When a lead acid car battery is recharged by the alternator, it acts essentially as an electrolytic cell in which solid lead(ii) sulfate is reduced to lead at the cathode and oxidized to solid lead(ii) oxide at the anode. suppose a current of is fed into a car battery for seconds. calculate the mass of lead deposited on the cathode of the battery.