A vertical wire carries a current vertically upward in a region where the magnet
ID: 1557889 • Letter: A
Question
A vertical wire carries a current vertically upward in a region where the magnetic field vector points toward the north. What is the direction of the magnetic force on this current due to the field? A) downward B) toward the north C) toward the east D) toward the south E) toward the west Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current toward you, and the wire on your left carries current away from you. From your point of view, the magnetic field at the point exactly midway between the two wires A) is zero. B) points upward. C) points downward. D) points away from you. E) points toward you.Explanation / Answer
1. Using Fleming's Left hand rule:
First finger points toward north
Second finger points upward.
Thumbs ( Direction of force) points toward west.
Hence correct option is E.
2. Using right hand rule:
For wire at right hand side: Thumb points toward you, so the finger wrapping in anticlockwise direction.
For wire at left hand side: Thumb points away from you, hence clockwise direction of fingers ( magnetic field)
They cancel out each other.
Hence correct option is A ( It is zero)