PH 221 Midterm Exam Asnwers 100% Correct
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1.A beam of light traveling in air is incident on a transparent plastic at an angle of incidence of 50o.
The angle of refraction is 35o. What is the index of refraction of the plastic?
1. A) 1.56
2. B) 1.34
3. C) 1.67
4. D) 1.43
2.
A long, straight wire carries a current of 2.5 A. Find the magnitude of the magnetic field 25 cm from
the wire.
3.
If a current is flowing with a value of 5.9 A, how much electron charge passes any single point
in 25 seconds?
2. A) 2.3 x 1020 e
3. B) 1.9 x 1020 e
4. C) 9.2 x 1020 e
5. D) 1.5 x 1020 e
4.
See the figure. The net force on the 1 nC charge is zero. What is q?
1. A) zero
2. B) 0.68 nC
3. C) 4.0 nC
4. D) 1.5 nC
5.
Estimate the average power output of the Sun, given that about 1350 W/m2 reaches the upper
atmosphere of the Earth. The distance from the Sun to the Earth is 1.5 × 1011 m.
1. A) 4 × 1026 W
2. B) 3 × 1026 W
3. C) 2 × 1026 W
4. D) 1 × 1026 W
6.
Which of the equations here is valid for the circuit shown?
1. A) 2 – 2I1 – 2I2 – 4I3 = 0
2. B) 6 – I1 – 2I2 = 0
3. C) -2 – I1 + 4 – 2I2 = 0
4. D) 4 – I1 + 4I3 = 0
7.
Starting from rest, a proton falls through a potential difference of 2700 V. What...