1.Our nearest star (other than the Sun) is 4.20 light-years away. That is, it ta

Question

1.Our nearest star (other than the Sun) is 4.20 light-years away. That is, it takes 4.20 years for the light it emits to reach Earth. How far away is it? 4% (A) 4.20x10m (B) 3.65x100 m, C) 6.42x10 m. (D) 5.28x10m (E) 1.25x10m, (F) 4.20x10 m (G) 7.25x10m (H) 3.97x1016 m 2.A long, straight wire carries a current moving down the page. What is the direction of the magnetic field at point P due to the current? 3 % (A) right. (B) left, (C) upward, (D) downward, (E) into the page, (F) out of the page, (G) Clockwise, (H) Counter-clockwise ) A long, straight wire carries a current pointing into the page. What is the direction of the magnetic field at point P due to the current? 3 % (A) right, (B) left, (C) upward, (D) downward, (E) into the page, (F) out of the page, (G) Clockwise, (H) Counter-clockwise. 31

Explanation / Answer

Solution:

1.The speed of light is 299 792 458 m / s

# of seconds in a year = 60seconds* 60 min *24 hours*365 days = 31 556 926 seconds

299 792 458 m / s * 31 556 926 seconds = 9.4605284 × 10^15 meters

4.2 * 9.4605284 × 10^15 meters = 4.2 light years = 3.97342193 × 10^16 meters (Option H)

2.Upward (option C) (Applying Right Hand Thumb Rule)

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