No magnetic force acts on a current carrying wire when it

A) carries a very small current.
B) is perpendicular to the magnetic field.
C) either or both of these
D) none of the above


Answer: D

Physics & Space Science

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2.9×10^7 is the same as

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Consider the two surfaces shown below. They are both immersed in a uniform vertical electric field, and have the same cross-sectional area on the horizontal plane. (The tile vectors shown are for a typical tile on each surface.) For which surface is the value of larger?

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A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100 ?. What is the average power loss?

A. 225 W B. 450 W C. 980 W D. 1.12 kW E. 900 W

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