# physics

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which of the following modifications to a solenoid would be most likely to decrease the strength of its magnetic field?
a. removing its iron rod core and increasing the number of coils
b. increasing the current and reducing the number of coils
c. reducing the number of coils and inserting an iron core
d. decreasing the current and reducing the number of coils

D

A stationary positive charge, Q, is located in a magnetic field, B, which is directed toward the right. What is the direction of the magnetic force on Q?
a. toward the right
b. up
c. down
d. there is no magnetic force

D

• physics -

D is correct for the first question.

D is also correct for the second question since the charge is not moving. If it moved, there would be a force

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