Force on a Wire: The direction of the force on a current-carrying wire in a magnetic field is

A. perpendicular only to the current.
B. perpendicular only to the magnetic field.
C. perpendicular to both the current and the magnetic field.
D. in the direction opposite to the current.
E. in same direction as the current.


Answer: C

Physics & Space Science

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A 15-mF capacitor and a 30-mF capacitor are connected in series, and charged to a potential difference of 50 V. What is the resulting charge on the 30-mF capacitor?

a. 0.70 mC b. 0.80 mC c. 0.50 mC d. 0.60 mC e. 0.40 mC

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Suppose that the Sun—Earth distance were 10 AU instead of 1 AU. Then the energy of sunlight received per square meter on Earth each second would be ________ it is today.

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Which of the following explanation is CORRECT about this statement?

A. This statement does not make sense, because we cannot see through the band of light we call the Milky Way to external galaxies; the dark fissure is gas and dust blocking our view. B. This statement makes sense, we can see through the band of light we call the Milky Way to external galaxies, as nothing is blocking our view. C. This statement makes sense, we can see through the band of light we call the Milky Way to external galaxies, and the binoculars are sensitive enough to view them even through the dark fissure of gas and dust blocking our view. D. This statement does not make sense, we can see through the band of light we call the Milky Way to external galaxies, but we need more sensitive equipment, than binoculars.

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The acceleration of a ball as it rolls down a ramp is 3 m/s2 . It starts from rest. (a) What is the ball's speed after 4 seconds? (b) How far does the ball travel during the 4 seconds?

Physics & Space Science