Choose all that apply. Objects that produce magnetic fields include which of the following?
(a) Current-carrying wires
(b) Permanent magnets
(c) A compass
(d) A glass rod rubbed with silk sitting on the table observed by a person standing on the floor
(e) A glass rod rubbed with silk when placed on a moving truck and observed by a person standing on the ground
(f) Current in a solenoid
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