Question:
What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30degree with the direction of a uniform magnetic field of 0.15 T?
Answer:
Current in the wire, I = 8 A
Magnitude of the uniform magnetic field, B = 0.15 T
Angle between the wire and magnetic field, 
= 30°.
Magnetic force per unit length on the wire is given as:
f= BI sin
= 
= 0.6 N m-1
Hence, the magnetic force per unit length on the wire is 0.6 N m-1.
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