defence exam BSF Head Constable (RO/RM) Mock Test 2023 Physics Current, Resistance and Electricity Electric Current
Which of the statement is not correct?
1
Current density j gives the amount of charge flowing per second per unit area parallel to the flow.
2
The work done per unit charge by the source in taking the charge from lower to higher potential energy is called the electromotive force (emf) of the source.
3
The emf is not a force, it is the voltage difference between the two terminals of a source in open circuit.
4
None of the above.