If a wire is placed parallel to the lines of force in a magnetic field and a current flows in the wire, then

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BPSC AE Paper 5 (Electrical) 25 Mar 2022 Official Paper
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  1. the wire will experience a force in the direction of the magnetic field
  2. the wire will not experience any force at all
  3. the wire will experience a force in the direction opposite to the field
  4. it will experience a force in the direction perpendicular to the lines of force

Answer (Detailed Solution Below)

Option 2 : the wire will not experience any force at all
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Detailed Solution

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Concept:

The force on a current-carrying wire placed in a magnetic field is given by:

F = BIL sinθ 

where B = magnetic field

I = Current

L = Direction of current 

θ = The angle between the direction of current and the magnetic field

Calculation:

If a wire is placed parallel to the lines of force in a magnetic field, then the value of θ is equal to zero.

F = BIL× (sin0°)

F = BIL× (0)

F = 0 N

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