An alpha particle (α), which is the same as a helium-4 nucleus, is momentarily at rest in a region of space occupied by an electric field. the particle then begins to move. find the speed of the alpha particle after it has moved through a potential difference of −3.45×10−3 v .the charge and the mass of an alpha particle are qα = 3.20×10−19 c and mα = 6.68×10−27 kg , respectively.

mechanical energy is conserved in the presence of which of the following types of forces? (select all that apply.)

(a) electrostatic
(b) frictional
(c) magnetic
(d) gravitational

Mechanical energy is conserved in the presence of following forces:

a) electrostatic force

b) magnetic force

c) gravitational force

Explanation:

Give data:

potential difference ,

we Know change in potential energy is given as

therefore, change in potential energy U is

let  speed of particle is  v

from energy conservation theorem

loss of electrical PE = KE gained

solving for v

Mechanical energy is conserved for following forces:

a) electrostatic force

b) magnetic force

c) gravitational force

answer:

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