PHY2054 B001, Fall 2008
Instructor: Dr. Bhattacharya
Test #2, Tuesday, Nov 13, 3:00 pm  4:15 pm
Name:
KEY
TO GET FULL CREDIT YOU MUST SHOW YOUR WORK
There are 10 questions in this test. Questions 18 are multiple choice and each worth 5 points.
Questions 6  10 are regular questions and each worth 10 points. Useful informations for this
test are provided on a separate sheet of paper. You are not allowed to use any other information
excepting those provided in this information sheet. While answering each question please be as
clear and speciFc as possible in explaining your notation, formula used,
etc
. Please use appropriate
units in each case as necessary.
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View Full Document1. The slide wire of the variable resistor in the Fgure is moved steadily to the left, decreasing
the resistance in the circuit. The induced current in the adjacent rectangular loop is
+

R
(a)
clockwise
(b) anticlockwise
(c) zero
(d) can be clockwise or anticlockwise
(e) none of the above
2. In a series R  L  C circuit, the voltage source produces an angular frequency
ω
. If this
frequency is increased slightly (there may be more than one correct choice),
(a) the total impedance will necessarily increase.
(b) the reactance will necessarily increase.
(c)
the impedance due to the resistor does not change
.
(d)
the total impedance increases if
ω
≥
1
/
√
LC
.
3. An electromagnetic wave of wavelength 600 nm is traveling in vacuum in the

z
direction.
The electric Feld points along the +ve
x
axis and has an amplitude 0.045 V/m. One of the
following statement is true for the magnetic Feld
B
:
(a) It has a magnitude 1
.
5
×
10
−
10
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 Fall '08
 ZMUDSKYY
 Physics, Work, Magnetic Field, refractive index, prms

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