JEE Advanced 2014 Physics question
Two parallel wires in the plane of the paper are distance apart. A point charge is moving with speed u between the wires in the same plane at a distance from one of the wires. When the wires carry current of magnitude I in the same direction, the radius of curvature of the path of the point charge is . In contrast, if the currents I in the two wires have directions opposite to each other, the radius of curvature of the path is . If , the value of is
Answer: 3
Solution
The charge is at distance from one wire and from the other. Between the wires, currents in the same direction produce opposite fields: $ = ( - ) =
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