The Figure below shows the magnetic fields from a bar magnet. Each of the red ar
ID: 1625380 • Letter: T
Question
The Figure below shows the magnetic fields from a bar magnet. Each of the red arrows represents the direction and magnitude (length of the arrow) of the magnetic field at that point. In addition there is a constant and uniform earth's magnetic field and this is represented by the green arrow. Only one green arrow is drawn, however bear in mind the earth's field is constant throughout the Figure. Your task is to work out the direction of the resultant magnetic field at the different points. Use the compass rose as your direction. Choose the direction that is closest to one of the directions. The resultant magnetic field at M is along The resultant magnetic field at Q is along The resultant magnetic field at K is along The resultant magnetic field at R is along The resultant magnetic field at L is along The resultant magnetic field at O is along There are two points where the earth's magnetic field cancels the bar magnetic fields. Locate the two points and enter their letters below. For the lab, at the zero field locations, a compass needle does not have any preference direction.Explanation / Answer
The resultant magnetic field at M is along - SE (as red and green lines are equal in length hence net add upto zero and zero vector do not have a definite direction so we can choose an arbitrary direction for it)
The resultant magnetic field at Q is along - SE (as red line is smaller than green line so net will be more closer to green line and hence closer to SE direction).
The resultant magnetic field at K is along - SE (as red line is smaller than green line so net will be more closer to green line and hence closer to SE direction).
The resultant magnetic field at R is along - SE (as red line is smaller than green line so net will be more closer to green line and hence closer to SE direction). (Note: Since exact length is not given so here answer can also be S)
The resultant magnetic field at L is along - SE (as red line is smaller than green line so net will be more closer to green line and hence closer to SE direction).
The resultant magnetic field at O is along - S (as red line is smaller than green line so net will be more closer to green line and hence closer to S direction).
The two points are M and G where net field is zero.
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