7. The magnetic force acting on a proton acts towards the south in a horizontal plane. If the proton is moving vertically upwards perpendicular to the horizontal plane, what will be the direction of the magnetic field in that region? Name the rule used to determine the direction in the above situation.
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Answer:
ANSWER
The direction of moving proton is the direction of current. according to the question:
The current in the upward direction with respect to the horizontal plane
Magnetic force is acting in the direction of north on the horizontal plane.
Apply Fleming's Left-hand rule : Hold your thumb, forefinger and second finger at right angle i.e perpendicular to each other,
Now Line up your second finger in direction of current i.e upwards and point your thumb in the direction of magnetic force i.e north in horizontal plan, now forefinger will point in direction of magnetic field , that is East on the horizontal plane.
Hence, from Fleming's left- hand rule we can determine that the magnetic field is in the direction of East on the horizontal plane
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