Explanation:
It is given that,
Length of wire, l = 0.53 m
Current, I = 0.2 A
(1.) Approximate formula:
We need to find the magnitude of the magnetic field made by the current at a location 2.0 cm from the wire, r = 2 cm = 0.02 m
The formula for magnetic field at some distance from the wire is given by :


B = 0.000002 T

(2) Exact formula:


B = 0.00000199 T
or
B = 0.000002 T
Hence, this is the required solution.
Answer:
A: Opposite
Explanation:
From Newton's third law of motion, to every action there is an equal an opposite reaction. Thus, when the wave hits a fixed boundary, it is returned as a reflected wave to the starting point albeit on the other side.
Answer:
n₂ = 1.15
Explanation:
Given,
Angle of incidence,θ₁ = 50°
refractive index of the glass,n₁ = 1.50
refractive index of liquid = ?
For largest refractive index angle of refraction should be equal to 90°.
Using Snell's law
n₁ sin θ₁ = n₂ sin θ₂
1.50 x sin 50° = n₂ sin 90°
n₂ = 1.15
Hence, refractive index of the liquid is equal to 1.15.
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