7. Consider two (1 and 2) silver wires both of which have constant circular cross sec- tional areas ; we are given the data: ; diameter = d Wire 2: length = 2L ; diameter = d/2 ; resistance = R, Wire 1: length = L resistance = R, %3D A potential difference ( V,) applied across wire 1 results in power dissipation of (P,) and a potential difference ( V,) applied across wire 2 results in power dissipation of (P,). If P, = P, then which answer choice gives a correct set of comparisons? a. R, > R, ; V,> V, b. R, > R, ; V, < V, c. R, = R, ; V, = V, d. R2 V, e. R2

University Physics Volume 2
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Chapter10: Direct-current Circuits
Section: Chapter Questions
Problem 69AP: Consider the circuit below. The battery has an emf of = 30.00 V and an internal resistance of r =...
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7. Consider two (1 and 2) silver wires both of which have constant circular cross sec-
tional areas ; we are given the data:
; diameter = d
Wire 2: length = 2L ; diameter = d/2 ; resistance = R,
Wire 1: length = L
resistance = R,
%3D
A potential difference ( V,) applied across wire 1 results in power dissipation of (P,)
and a potential difference ( V,) applied across wire 2 results in power dissipation of
(P,).
If P, = P, then which answer choice gives a correct set of comparisons?
a. R, > R, ; V,> V,
b. R, > R, ; V, < V,
c. R, = R, ; V, = V,
d. R2 <R, ; V,> V,
e. R2 <R, ; V, <V;
Transcribed Image Text:7. Consider two (1 and 2) silver wires both of which have constant circular cross sec- tional areas ; we are given the data: ; diameter = d Wire 2: length = 2L ; diameter = d/2 ; resistance = R, Wire 1: length = L resistance = R, %3D A potential difference ( V,) applied across wire 1 results in power dissipation of (P,) and a potential difference ( V,) applied across wire 2 results in power dissipation of (P,). If P, = P, then which answer choice gives a correct set of comparisons? a. R, > R, ; V,> V, b. R, > R, ; V, < V, c. R, = R, ; V, = V, d. R2 <R, ; V,> V, e. R2 <R, ; V, <V;
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