If an electroscope is charged by induction
A)
nothing will happen since electroscopes require being charged by conduction.
B)
it will acquire a negative charge.
C)
its leaves will separate because of the interaction of the charges.
D)
its leaves will remain attached.
E)
it will acquire a positive charge.
C
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A thin copper rod that is 1.0 m long and has a mass of 0.050 kg is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to cancel the weight of the rod?
A) 1.2 A B) 7.6 A C) 2.5 A D) 4.9 A E) 9.8 A
Explain why in space, "no one can hear you scream."
What will be an ideal response?
A spiral galaxy is the result of the collision and merger of galaxies that leave moderate to large amounts of gas in the system.
Answer the following statement true (T) or false (F)
An inertial frame of reference is a frame of reference that
A. is undergoing an acceleration B. is not undergoing an acceleration C. moves at the speed of light D. is always at rest