Question

An overhead power transmission line carries a current from east to west direction. Then magnetic field at point 1.5 m north of the line is in

• A. North direction
• B. South direction
• C. Vertically upward direction(outside the plane of paper)
• D. Vertically downward direction(inside the plane of paper)

Answer 1

The correct option is A North direction

Given: current is in the direction from east to west
Solution: This question can be solved using concept of right hand thumb rule
If right hand thumb is in the direction of of current
Then curled finger show the direction of magnetic field
According to the question if we place our right hand thumb in the current direction that is from east to west then direction of magnetic field will be towards north
Hence correct answer will be option A