PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity
Problem
While analysing a network, a student assumes a branch current Ix to flow towards a node but obtains Ix=−0.8A after solving the equations. What does the negative sign physically indicate?
(a) The magnitude of the current has been calculated incorrectly; it should still flow as assumed but with 0.8A. (Wrong interpretation of sign)
(b) The actual current is 0.8A flowing opposite to the assumed direction.
(c) The node potential has turned out negative with respect to ground.
(d) The negative sign shows that 0.8A of electron current flows in the assumed direction, so the result is acceptable.