A31 mc charge is positioned on the x axis at x + 8 cm. where should a -70 mc charge be placed (on the positive x-axis) to produce a net electric field of zero at the origin?

r=12.02 cm

Explanation:

Given

Placed at x=8 cm

placed at a distance, suppose r

Electric field due to positive charge will be away from the origin and electric field due to negative charge is towards the origin

Thus net effect will be zero

Equate

r=12.02 cm

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .