If you removed the core from an electromagnet, which of the following would occur?

A.)The magnetic field would be greatly weakened.
B.)The electric current in the coils would be greatly reduced.
C.)The poles of the magnetic field would be reversed.
D.)The magnetic field would be turned off.

Aparticle moves according to a law of motion s = f(t), 0 ≤ t ≤ 12, where t is measured in seconds and s in feet. f(t) = cos(πt/6) (a) find the velocity at time t (in ft/s).

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.