Author Question: A narrow copper wire of length L and radius b is attached to a wide copper wire of length L and ... (Read 400 times)

lbcchick · **on:** Jul 29, 2018

A narrow copper wire of length L and radius b is attached to a wide copper wire of length L and radius 2b, forming one long wire of length 2L. This long wire is attached to a battery, and a current is flowing through it.

If the electric field in the narrow wire is E, the electric field in the wide wire is A) E.
B) 2E.
C) 4E.
D) E/2.
E) E/4.

Question 2

A glass plate whose index of refraction is 1.66 is immersed in a liquid. The surface of the glass is inclined at an angle of 44 with the vertical. A horizontal ray in the glass is incident on the interface.

When the liquid is a certain alcohol, the incident ray arrives at the interface at the critical angle. The index of refraction of the alcohol is closest to: A) 1.15
B) 1.13
C) 1.11
D) 1.09
E) 1.17