A current loop `ABCD` is held fixed on the plane of the paper as shown in figure. The arcs `BC( radius = b) and DA ( radius = a)` of the loop are joined by two straight wires `AB and CD` at the origin `O` is 30^(@)`. Another straight thin wire with steady current `I_(1)` flowing out of the plane of the paper is kept at the origin . Due to the process of the current `I_(1)` at the origin:A. The forces on `AD` and `BC` are zero.B. The magnitude of the net force on the loop is given by `(mu_(0)I_(1)I)/(4pi)[2(b-a)+pi/3(1+b)]`C. The magnitude of the net force on the loop is given by `(mu_(0)II_(1))/(24ab)(b-a)`D. the forces on `AB` and `DC` are zero.

A current loop `ABCD` is held fixed on the plane of the paper as shown

1.	A current loop `ABCD` is held fixed on the plane of the paper as shown in figure. The arcs `BC( radius = b) and DA ( radius = a)` of the loop are joined by two straight wires `AB and CD` at the origin `O` is 30^(@)`. Another straight thin wire with steady current `I_(1)` flowing out of the plane of the paper is kept at the origin . Due to the process of the current `I_(1)` at the origin:A. The forces on `AD` and `BC` are zero.B. The magnitude of the net force on the loop is given by `(mu_(0)I_(1)I)/(4pi)[2(b-a)+pi/3(1+b)]`C. The magnitude of the net force on the loop is given by `(mu_(0)II_(1))/(24ab)(b-a)`D. the forces on `AB` and `DC` are zero.
Answer» Correct Answer - 1 Magnetic field due to `l_(1)` is parallel to `AD` and `BC`.So that force On `AD` and `BC` is zero.

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