Perform the following experiment: The purpose of this experiment is to use a com

Question

Perform the following experiment: The purpose of this experiment is to use a compass to detect the weak magnetic field that exists around a current-carrying conductor. Breadboard a circuit consisting of a switch, a 12 V lamp, and 12 V dc power supply all connected in series. 1. With the switch open, position the compass on the top of and parallel with the conductor. 2. Briefly close the switch and watch the compass needle for any change. 3. Repeat with the compass positioned below the conductor. 4. Repeat with the polarity of the dc voltage source reversed. a) In what general direction does the compass needle tend to move to position itself when current flows through the conductor? b) How does the direction of the compass needle movement compare when the compass is placed on top and beneath the conductor? c) How does the direction of the compass needle movement compare when the polarity of the dc voltage source is reversed?

Explanation / Answer

a:when current flows a magnetic field is created in vicinity of the conductor the magnetic needle points approximately in the direction of the local magnetic field produced b:Since the magnetic field lines generated are concentric circles , the direction of field is opposite at any two diametrically opposite points. hence, magnetic neddle points in opposite directions at above and below respectively. c:When polarity of DC source is changed the direction of magnetic field lines reverses, as a result needle points in directions opposite to previous one.

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