Question 23 Not yet answered Points out of 1.00 Flag question A solenoid of leng

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Question 23 Not yet answered Points out of 1.00 Flag question A solenoid of length 15 cm consists of a wire wrapped tightly around a wooden core. The magnetic field strength is 1.0 T inside the solenoid. If the solenoid is stretched to 27 cm by applying a force to it, what does the magnetic field become? Select one: A8T B. 6.6 T C 1.0 T D. 1.8 T E. 0.6 T Question 24 Not yet answered Points out of 1.00 Flag question An electron enters a magnetic field of 0.55 T with a velocity perpendicular to the direction of the field. At what frequency does the electron traverse a circular path? Question 25 Answer saved Points out of 1.00 Remove flag Select one: A. 1.5x10^4 Hz B. 1.5 X 10^10 Hz C. 6.7x10^-11 Hz D. 0.55x10^-7 Hz E. 6.7x10^7 Hz Question 25 Answer saved Points out of 1.00 Remove flag In the figure, a ring 0.71 m in radius carries a charge of + 580 nC uniformly distributed over it. A point charge Q is placed at the center of the ring. The potential is equal to zero at point P, which is the same as the potential at infinity. P is on the axis of the ring, and 0.73 m from its center. The point charge Q is Select one: A. +300 nC B. +420 nC C.+210 nC D.-120nC E. None of these.

Explanation / Answer

On #24, note that

f = q B / [2 pi m]

Thus,

f = 1.5*10^10 Hz   [OPTION B]

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