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Question
What can be said about the direction of force, if the current is reversed in the conductor placed in a magnetic field?
Options:
A .  It will not change.
B .  It will be reversed.
C .  It changes by 90∘.
D .  It changes by 45∘.
Answer: Option B
:
B
A current carrying conductor placed in a magnetic field experiences a force if the current and magnetic field are mutually perpendicular. The direction of this force can be found out with the help of Fleming's Left Hand Rule. However, if the direction of the current in the conductor is reversed, then the direction of the force acting on it also gets reversed, i.e. the direction of force changes by 180.

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