Two wires are carrying current as shown below. You do not know how much current

Question

Two wires are carrying current as shown below. You do not know how much current is flowing in the wire on the left, wire A. You do know that: 5mA is flowing downward through wire B. The B-field at a point 5mm to the right of wire B is zero. The distance between wire A and wire B is 20mm. Using your knowledge of how the thumb points in the direction of the current and then the fingers wrap in the direction of the B-field, what is the direction and magnitude of the current in wire A? And what is the direction and magnitude of the B-field at the midpoint between the two wires?

Explanation / Answer

B due to right wire at point B is out of the page. so to cancel it B due to left wire should be inside the page

thus CURRENT IN LEFT WIRE IS GOING UPWARDS

Magnitude of CURRENT IN WIRE ON THE LEFT = 25 mA .

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