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Question 1 A concave mirror with a radius of 30 cm creates a real image 40 cm from the mirror. What is the object distance?

Question 1
A concave mirror with a radius of 30 cm creates a real image 40 cm from the mirror. What is the object distance?

A. 24 cm
B. 10 cm
C. 5.0 cm
D. 70 cm

Question 2
A long, straight wire carries a current of 2.5 A. Find the magnitude of the magnetic field 25 cm from the wire.

Question 3
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.

A. 4 × 1026 W
B. 3 × 1026 W
C. 2 × 1026 W
D. 1 × 1026 W

Question 4
Starting from rest, a proton falls through a potential difference of 2700 V. What speed does it acquire?

A. 3.6 × 105 m/s
B. 4.8 × 105 m/s
C. 2.4 × 105 m/s
D. 7.2 × 105 m/s

Question 5
If a current is flowing with a value of 5.9 A, how much electron charge passes any single point in 25 seconds?

A. 1.9 x 1020 e
B. 9.2 x 1020 e
C. 1.5 x 1020 e
D. 2.3 x 1020 e

 

 

Question 6
A flux of 4.0 × 10-5Wb is maintained through a coil for 0.50 s. What emf is induced in this coil by this flux?

A. 8.0 x 10-5 V
B. 2.0 x 10-5 V
C. No emf is induced in this coil.
D. 4.0 x 10-5 V

Question 7
Which of the equations here is valid for the circuit shown?

A. 6 – I1 – 2I2 = 0
B. 4 – I1 + 4I3 = 0
C. -2 – I1 + 4 – 2I2 = 0
D. 2 – 2I1 – 2I2 – 4I3 = 0

 

 

 

 

 

 

Question 8
See the figure. The net force on the 1 nC charge is zero. What is q?

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A. 8.0 nC
B. 16 nC
C. zero
D. 0.68 nC


Question 9
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?

A. 1.67
B. 1.43
C. 1.34
D. 1.56


Question 10
If the force between two charges increases by a factor of 16 because the charges are moved closer together, how much closer are they moved?

A. 8
B. 16
C. 4
D. 2

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