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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How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.

Ascientific blank must be testable and capable of being proven false?