A particle of mass m and charge q is in a region with a constant B-field in the x-direction, B~ = Bxˆ. The initial velocity of the particle is ~v = v0xxˆ + v0yyˆ. The particle moves in a helix. (a) Show that the radius of the helix is r = mv0y/(qB) (b) Show that the time to complete one rotation in the helix is τ = 2πm/(qB)

there was no answer choices but i think its representative

most of them using statistics and defining how things are being measured

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.