Answer
given,
F₁ is horizontal = 40 N
F₂ is normal = 20 N
F₃ is parallel = 30 N
work done by
W₂ = 0 as force is acting perpendicular to the direction of motion.
as the motion moved to 0.8 cm
W₃ = F₃ x d
W₃ = 30 x 0.8
W₃ = 24 J
W₁ = F₁ x d
W₁ = F₁ cos ∅ x d
W₁ = 40 cos 30⁰ x 0.8
W₁ = 27.21 J
Helium has only 2 electrons in it's valence shell
So, option D is your answer.
Hope this helps!
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Answer:
Electric force,
Explanation:
It is given that,
Charge on the particle, 
Electric field,
Let F is the electric force acting on the charged particle. The electric force per unit electric charge is called electric field. Mathematically, it is given by :



So, the force acting on the charged particle is
. Hence, this is the required solution.