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Solution


Q.

The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is:
1 45∘  
2 60∘  
3 90∘  
4 180∘  

Ans.

(4)

The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is 180∘

A force is experienced by the current carrying wire in the presence of an external magnetic field. This can be expressed as:

F=BILsinθ

Where,

L is the length of the wire, I is the current, and θ is the angle between the current and the magnetic field.

We know that sin180∘=0 Therefore, the force exerted on a current carrying wire that is placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is 180∘