Question

what is the magnitude of force experience by the wire if current carrying wire is kept is parallel to the magnetic field​

Answer 1

0. The wire will not experience any force until and unless it is kept perpendicular to magnetic field.

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Answer 2

A current carrying conductor placed in a magnetic field experiences a force. If the direction of the field and that of current are mutually perpendicular to each other, then the force acting on the conductor will be perpendicular to both and that can be determined using the Fleming's left-hand rule.