Acopper wire of length 16 cm is in a magnetic field of 0.19 t. if it has a mass of 9.0 g, what is the minimum current through the wire that would cause a magnetic force equal to its weight?

2.9 A

Explanation:

L = 16 cm = 0.16 m

B = 0.19 T

m = 9 g = 0.009 kg

Let the minimum current be i.

Magnetic force is balanced by the gravitational force

B x i x L = m x g

0.19 x i x 0.16 = 0.009 x 9.8

i = 2.9 A

1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2