4. [1pt] Consider two sections of wires with currents as shown. Select T-True, F

Question

4. [1pt] Consider two sections of wires with currents as shown.

Select T-True, F-False. If the first is T and the rest F, enter TFFFF. A) The force on the short wire due to the long wire is toward the left. B) If a positively charged particle were placed at rest at point P (i.e. sitting just outside the short wire), it would feel zero force from magnetic fields C) If the short wire were moved further away from the long wire, the net force on it would be precisely the same. D) If the short wire were free to rotate about its fixed center (P), from the position shown, its inital rotation would be clockwise. E) The magnetic field of the long wire points into the paper at the location of the short wire.

Explanation / Answer

A) The force on the short wire due to the long wire is toward the left.
B due to long wire at p will be coming out of paper and I is upward.
So force will be towards the right
False

B) If a positively charged particle were placed at rest at point P (i.e. sitting just outside the short wire), it would feel zero force from magnetic fields
Since proton is at rest. Force will be 0
True

C) If the short wire were moved further away from the long wire, the net force on it would be precisely the same.
As deistance incraeses, magnetic field will become weaker and hence force will be less
False

D) If the short wire were free to rotate about its fixed center (P), from the position shown, its inital rotation would be clockwise.
As told in 1stpart, force on it is towards right and this force decreases as we move up.
So it will rotate counter clockwise
False

E) The magnetic field of the long wire points into the paper at the location of the short wire.
Its up the paper as told in part a
False

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