4_2 - Clickers - Curl and grad and conservative forces

# 4_2 - Clickers - Curl and grad and conservative forces -...

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Can you come up with equipotential lines for the 3 force fields below? Draw it if possible

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A) = 0 everywhere B) ≠ 0 everywhere C) =0 in some places D) Not enough info to decide What is the curl ( x F ) of this vector field, F ?
Now think about line integrals about various loops, to convince yourself they are always 0 in the “curl-free” cases.

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4 Consider the vector field , where E0 is a constant, and consider the closed square path L shown. What can you say about the line integral ? A) It is positive B) It is negative C) It is zero D) It cannot be determined from the information given! E = E 0 ˆ i E d l
Consider the three closed paths 1, 2, and 3 in some vector field F , where paths 2 and 3 cover the larger path 1 as shown. What can you say about the 3 path integrals? 1 2 3 A) F d s 1 > F d s 2 + F d s 3 B) F d s 1 < F d s 2 + F d s 3 C) F d s 1 =

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## This note was uploaded on 02/27/2012 for the course PHYSICS 2210 taught by Professor Stevepollock during the Spring '11 term at Colorado.

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4_2 - Clickers - Curl and grad and conservative forces -...

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