Classify the planets as terrestrial planets or gas

terrestrial planet :-

Terrestrial planet are made from rock and inner planet

planet made from gas :-

all of these planet are made up from gases, each of these planet has many moon, and it's also have a ring.

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a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

the higher the current the higher the mag field around it the higher the influence on the compass