In Hans Oersted's experiment, why did a compass needle move when an electric current flowed through a nearby wire?

A: the current created a magnetic field around the wire

B: the current changed..earth's magnetic field

C: the compass conducted electricity

D: the compass was broken

pl answer correctly

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•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two