Question 1. 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. 1 × 10²⁶ W

B. 4 × 10²⁶ W

C. 3 × 10²⁶ W

D. 2 × 10²⁶ W

Question 2. 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. 4.0 x 10^-5 V

B. No emf is induced in this coil.

C. 2.0 x 10^-5 V

D. 8.0 x 10^-5 V

Question 3. A beam of light traveling in air is incident on a transparent plastic at an angle of incidence of 50^o. The angle of refraction is 35o. What is the index of refraction of the plastic?

A. 1.56

B. 1.43

C. 1.34

D. 1.67

Question 4. A concave mirror with a radius of 30 cm creates a real image 40 cm from the mirror. What is the object distance?

A. 70 cm

B. 10 cm

C. 5.0 cm

D. 24 cm

Question 5. A long, straight wire carries a current of 2.5 A. Find the magnitude of the magnetic field 25 cm from the wire.

Question 6. 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. 4

C. 2

D. 16

Question 7. See the figure. The net force on the 1 nC charge is zero. What is q?

A. 8.0 nC

B. zero

C. 0.68 nC

D. 16 nC

Question 8. If a current is flowing with a value of 5.9 A, how much electron charge passes any single point in 25 seconds?

A. 2.3 x 10²⁰ e

B. 9.2 x 10²⁰ e

C. 1.5 x 10²⁰ e

D. 1.9 x 10²⁰ e

Question 9. Starting from rest, a proton falls through a potential difference of 2700 V. What speed does it acquire?

A. 7.2 × 10⁵ m/s

B. 2.4 × 10⁵ m/s

C. 3.6 × 10⁵ m/s

D. 4.8 × 10⁵ m/s

Question 10. Which of the equations here is valid for the circuit shown?

A. 2 - 2I₁ - 2I₂ - 4I₃ = 0

B. 4 - I₁ + 4I₃ = 0

C. 6 - I₁ - 2I₂ = 0

D. -2 - I₁ + 4 - 2I₂ = 0