I. Right hand rule Underneath a long straight current flowing to the right, in w
ID: 1624388 • Letter: I
Question
I. Right hand rule Underneath a long straight current flowing to the right, in what direction does the magnetic field point?
II. If a rightward- flowing current is placed into a magnetic field which itself is pointing into the board, in what direction will the current be forced
III. A metal rod faces North/South on two metal rails that run East/West. There is a resistor running North/South and clamped down to complete a metal rectangle. Some sort of mechanical force is applied to the metal rod so that it is pulled Eastward along the rails and thereby progressively expands the area of the rectangle. The whole apparatus is submerged in a constant magnetic field which points up toward the ceiling.
IIIa. In what direction will positive charges in the rod be forced to move(North? West?
IIIb. In what direction will current necessarily begin to flow? (clockwise?counterclockwise?
Explanation / Answer
Part I) As per Right hand rule; curl your finger of your right hand around the conductor such that your thumb will point in the direction of the current, now the direction in which your fingers will point is the direction of the magnetic field here magnetic field will point out of the plane of the paper.
Part II) Align the middle finger of your left hand in the direction of current and forefinger in the direction of magnetic field than your left hand thumb will point in the direction of the force. So here force will be experienced downwards.
Part III a) Charges will be forced to move towards west.
Part III b) As we expand the area the magnetic flux linked with the rectangular loop will increases and as per the Lenz's law current will be induced such that it will try to reduce the flux (i.e. oppose the cause) so induced current is necessarily clockwise.