{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# Quiz2 - Physics 3123(Spring 2011 2nd Quiz 1 Calculate the...

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Physics 3123 (Spring 2011), 2nd Quiz 4/8/11 1. Calculate the reﬂection coeﬃcient for light at an air-to-copper interface (µair ≈ µcopper ≈ µ0 , ǫair ≈ ǫ0 , σcopper = 6.0 × 107 Ω−1 m−1 ) at optical frequencies (ω = 4 × 1015 /s). Use that σcopper ≫ εcopperω . The numerical result is not required; you may give your answer in terms of the quantities that are given above. (30 points) 2. Find the gradient of the scalar, retarded potential V (r, t) of a general charge distribution ρ in terms of integrals involving ρ and its time derivative ρ. (30 points) ˙ 3. Consider a point charge that moves with a constant velocity v along the positive x-axis of a cartesian coordinate system. At time t = 0 the charge is located at the origin r = 0 of the coordinate system. Find the scalar Li´nard-Wiechert potential V (0, t) and the electric ﬁeld E(0, t) produced e by the charge at the origin at times t > 0. (40 points) 1 ...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online