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?

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 35^o. 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.