Rochannthiesnoelin
Answered

An electric current is created in a long thin wire. How will increasing the current and changing the direction of the current effect the direction that a compass placed under the wire will point?

AIt compass will spin continuously.
BThe compass will flip exactly 180 degrees.
CThe compass will spin exactly 360 degrees.
DThe compass will not react and still point north.

Verified Answer :

The answer is : B. The compass will spin exactly 360 Degrees

Compass will point out to the earth's magnetic field. If we change the direction of the current , we created an effect which make the compass detect the magnetic field in the exact opposite direction, that is why it will flip exactly 180 degrees

glovertristans

On USATestprep it is B 180 degrease