What is the requirement for a core to be used in an electromagnet?
oa. it must be able to be increased.
b. it cannot be magnetized.
c. it must be an ion.
d.
it must be able to be magnetized.

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

What object a collides with object b and bounces back its final momentum is?

(a) if the pressure in gas is doubled while its volume is held constant, by what factor do (i) vrms and (ii) change? (b) is it possible to boil water at room temperature (20oc) without heating it? explain.