1. (2 pts) A conventional current of 0.1 A is flowing through a copper wire of r

Question

1. (2 pts) A conventional current of 0.1 A is flowing through a copper wire of radius 0.I mm. How many electrons per second are drifting through the wire? Answer 2. (2 pts) Electron current is flowing through the long wire from south to north. A compass is situated below the wire. The diagram shows the situation as seen from the top, looking down at the wire, and the compass, shown as a circle, below the wire. Draw the likely direction of the compass needle. Carefully show the north and south poles of the compass needle 3. (2 pts) A circular current loop made of copper wire and a hobby magnet are hung from the ceiling, with the north pole of a hobby magnet facing the loop. If you stand near the north pole and face the loop, the current in the loop is anti-clockwise. Which of the following statements is correct? (There may be more than one correct statement) a. b. c. d. e. The loop and magnet repel each other The loop and magnet attract each other The loop does not move but attracts the magnet The magnet does not move but repels the loop Since copper is not magnetic, there is no interaction 4. (2 pts) An electron and proton are moving with identical velocities, parallel to each other and abreast of each other. The magnetic field at the central point between them is a. b. c. d. Zero Double the field of either one of them Four times the field of either one of them Equal to the field of a magnetic dipole at a distance far from the dipole

Explanation / Answer

Solving 1st question of the page

Given

Current in wire=0.1 A

Charge flowing in 1 sec=0.1C

I electron=1.6*10(-19) C

No of electron per sec=0.1/(1.6*10(-19))=6.25*10(17) electrons

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