a. the magnitude of current in a wire is proportional to the magnetic field around the wireb. increasing the number of loops in an electromagnet causes the strength of the magnetic field to increasec. in a magnetic material, the electrons act like tiny magnetsd. the magnetic force on a current-carrying wire in a magnetic field is parallel to the direction of the current
d, magnetic fields are at right angles to the direction of current. There is a trick you can do with your hand pointing like a gun with your middle finger at 90 degrees to the other two wich show current, magnetic field and something else I can't recall.
Stick with the recommended PSI in the owners manual. The max is the amount of air that the tire can safely hold.
Fill it to about 2 PSI below max recommended on the tire. Anything under that and it will start dragging your gas mileage down. Also, get into the habit of checking what the tire says, not what the owner manual states. Eventually you are going to replace those tires and the PSI will probably be different. Take care!
d. the magnetic force on a current-carrying wire in a magnetic field is parallel to the direction of the current This Is Absolutely False
(D) is false. The magnetic force is perpendicular to the direction of the current. That's because the force is determined by evaluating a vector cross-product of the current and the magnetic field, and if v is a cross-product of v_1 and v_2, v is necessarily orthogonal to v_1 and v_2.
