A battery of e.m.f 3.0V is connected across a potentiometer wire AB of length 10\(\Omega m^{-1}\) as illustrated in the diagram above. If the jockey J makes contact at the 30cm mark, determine the resistance of length AJ and voltage across AJ.
The diagram above illustrates two charged bodies, X and Y separated by a distance r. Each body has charge q and mass m. Which of the following statements about the electrostatic force \(F_{e}\) and gravitational force \(F_{g}\) acting between the bodies is correct?
A.
\(F_{e}\) is attraction while \(F_{g}\) is repulsion
B.
Both \(F_{e}\) and \(F_{g}\) are that of repulsion
C.
Both \(F_{e}\) and \(F_{g}\) is that of attraction
D.
\(F_{e}\) is repulsion while \(F_{g}\) is attraction
