Because mass and distance determine gravity, so the more mass you have, the more gravity.
Explanation:
Now, looking down the solenoid tube determine what direction is the winding. If clockwise in relation to the positive wire then is the south pole, if anti-clockwise then is the north pole. So, to summarize the magnetic south pole is always clockwise in relation to the positive wire.
the answer A. since power is Joules/seconds and energy is rated in Joules
