In the circuit shown, the current passes through the rectangular strip. Current
ID: 1359132 • Letter: I
Question
In the circuit shown, the current passes through the rectangular strip. Current is defined in terms of motion of positive charges, In which direction is the current in the strip? If the charge carriers are negative, their motion is in the opposite direction of the current. In which direction do these charge carriers move through the strip ? An external magnetic field is made to pass through the strip. The field is directed out of and perpendicular to the page, Assuming the charge carriers are negative, in which direction is the magnetic force on the charge carriers? Which side of the strip has a higher potential (i.e., has a positive charge): alpha or b?
Explanation / Answer
(a)
(i)
the current direction is the direction of positive charges
direction = left to right ( i.e potive to negatice terminal along the wire
(ii)
electrons move from right to left
(b)
Fb = q*(v cross B)
v is left
B is out
Fb is towards a
(ii)
the end b is positive
end b is at high potential