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## Homework Statement

A magnetic field of 1.4 T [N] is 4.0 m wide. A very long wire crosses the field.

a) If the current in the wire is 2.0 A [W], find the magnetic force on the wire.

b) What will happen to the force on the wire if

i) The wire is rotated slightly in the horizontal plane?

ii) The current is doubled?

iii) The magnetic field is reversed?

## Homework Equations

F_m=ILB

## The Attempt at a Solution

a)

a) F_m=ILB

F_m=(-2.0)(4.0)(1.4) F_m=-11.2N=11N

F_m=11N [down]

Therefore the magnetic force on the wire is 11N [down]

b)

i) Since the wire is no longer in a 90 degree angle the magnetic force will decrease and the angle will change

ii) The magnetic force will double and the current will move twice as fast.

iii) The direction of the force will reverse.

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