The magnetic force per unit length on the wire is 3.5 N
Explanation:
The strength of the force on a current carrying wire due to a magnetic field is given by
where
I is the current in the wire
L is the length of the wire
B is the strength of the magnetic field
is the angle between the direction of I and B
In this problem, we have
I = 10 A is the current in the wire
B = 0.5 T is the magnitude of the magnetic field
is the angle
Re-arranging for , we find the force per unit length on the wire:
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