railway RRB Technician Grade 1 Mock Test 2024 Physics Current, Resistance and Electricity Electric Current
Consider a current carrying wire (current I ) in the shape of a circle. Note that as the current progresses along the wire, the direction of j (current density) changes in an exact manner, while the current I remain unaffected. The agent that is essentially responsible for is
1
source of emf.
2
electric field produced by charges accumulated on the surface of wire.
3
the charges just behind a given segment of wire which push them just the right way by repulsion.
4
the charges ahead.