Active Figure Magnetic Field Due To A Long Straight Wire In the animation below,

Question

Active Figure Magnetic Field Due To A Long Straight Wire In the animation below, a group of compasses are arranged in a circle centered on a long straight wire. When no current is present in the wire, all compasses are dominated by the magnetic field of the Earth, and thus point north when the current in the wire is large enough to produce a magnetic field much larger than that of the Earth, the compass needles point in a direction determined by Right-Hand Rule #2. Instructions: Use the siders to acjust the current in the wire and the radius of the circle that defines the compass placement. Explore Danish physicist Oersted was first to note the connection between electricity and magnetism by observing how compass needies are deflected when placed nearby a current-carrying wire A small compass may be used to determine the direction of the magnetic field at any point. According to observation, the direction of the magnetic field produced by a long wire carrying a current is tangent to a circle centered on the wire. The choice of tangent is determined by Right-Hand Rule #2 f the wire is grasped in the right hand with the thumb in the direction of the current, the fingers will curl in the direction of Thus, when looking down on the orde, Right-Hand Rule # 2 tells you whether the magnetic field is oriented in the dockwise or counter-clockwise sense The magnitude of this magnetic field is inversely proportional to the radial distance from the wire: No 2TF compass radiu Display in a New Window In order to observe this effect, the magnetic field from the wire must be much stronger then the magnetic field of the Earth. This can be achieved with large currents and/or small values of

Explanation / Answer

for the given options

a. compass points counter closckwise : from right hand rule, current is up
b. compass all point north : No current in wire
c. compass point cloackwise L from right hand rule, curret is down
d. compass all point south : No match
e. compass do not point north and are not tangent to the circle : current is small / radius is large

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