Question

A printer is connected to a 1.0 m cable. if the magnetic force is 9.1 × x10-5 n, and the magnetic field is 1.3 × 10-4 t, what is the current in the cable

Answer 1

The magnetic force on a current-carrying wire due to a magnetic field is given by

`F=ILB`
where
I is the current
L the wire length
B the magnetic field strength

In our problem, L=1.0 m,
`F=9.1 \cdot 10^(-5) N` and
`B=1.3 \cdot 10^(-4)T`, so we can re-arrange the formula to find the current in the wire:

`I= (F)/(LB)= (9.1 \cdot 10^(-5) N)/((1.0 m)(1.3 \cdot 10^(-4) T)) =0.7 A`