Which type of curved mirror uses its inside as the reflecting surface? A. a convex mirror B. a plane mirror C. a virtual mirror
D. a concave mirror
2 answers:
Answer:
Concave Mirror
Explanation:
1).Concave Mirror
here the reflecting surface is curved inside then it is always concave mirror
2). Convex mirror
here the curved surface outwards will be the reflecting surface and focus is taken as negative as it always forms virtual image of smaller size.
3). Plane Mirror
here the reflecting surface is always plane surface and straight surface and its focus is infinite and always forms virtual image of same size
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Complete Question
A 10 gauge copper wire carries a current of 20 A. Assuming one free electron per copper atom, calculate the drift velocity of the electrons. (The cross-sectional area of a 10-gauge wire is 5.261 mm2.) mm/s
Answer:
The drift velocity is
Explanation:
From the question we are told that
The current on the copper is
The cross-sectional area is
The number of copper atom in the wire is mathematically evaluated
Where is the density of copper with a value
is the Avogadro's number with a value
Z is the molar mass of copper with a value
So
Given the 1 atom is equivalent to 1 free electron then the number of free electron is
The current through the wire is mathematically represented as
substituting values
=>