A positively charged particle projected westward experiences a deflection toward the north in a magnetic field. Determine the direction of this magnetic field.
The direction of the magnetic field can be determined by the .
According to the rule, if we arrange our thumb, forefinger and the middle finger of the , then the thumb points towards the direction of the , the middle finger the direction of and the forefinger the direction of .
Since the direction of positively charged alpha particle is towards west, the direction of current will be the . Again the direction of magnetic force would be towards the .