A Straight Wire of Length 20 Cm Floats in a Horizontal

question 9

Multiple Choice

A straight wire of length 20 cm floats in a horizontal perpendicular to a magnetic field of 1.5 T when a current of 1.3 A passes through the wire in a perpendicular direction to the magnetic field. Find the mass per unit length of the wire. (The wire is connected to a battery by ultra light flexible leads.)

• A) 0.40 kg/m
• B) 0.20 kg/m
• C) 20 g/m
• D) 40 g/m
• E) none of the above

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