Problem 4: An infinite conducting cylindrical shell has radius 0.45 m and surface charge density 2.4 μC/m2. What is the magnitude of the electric field, in newtons per coulomb, 1.9 m from the axis of the cylinder?

c)as speed changes, wavelength and frequency change.

everything changes!

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

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.