Explanation:
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8 POINTS AND MARK BRAINIEST:
2 answers:
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Answer:
q₁ = -2.92 nC
Explanation:
Given;
first point charge, q₁ = ?
second point charge, q₂ = 10 nC
net flux through the surface of the sphere, Φ = 800 N.m²/C
According to Gauss’s law, the flux through any closed surface (Gaussian surface), is equal to the net charge enclosed divided by the permittivity of free space.
where;
Φ is net flux
net charge enclosed
ε₀ is permittivity of free space.
= Φε₀
= 800 x 8.85 x 10⁻¹²
= 7.08 x 10⁻⁹ C
= 7.08 nC
q₁ + q₂ =
q₁ = - q₂
q₁ = 7.08nC - 10 nC
q₁ = -2.92 nC
Answer:
option A
Explanation:
given,
lamp position from pool wall = 2.5 m
height of the pool = 2.5 m
now,
from the triangle
θ = i = 45°
using Snell's law
n₁ sin i = n₂ sin r
n₁ =4/3 n₂ = 1
now,
r = sin⁻¹(0.9428)
r = 70.5°
hence, the correct answer is option A
