defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Physics Current, Resistance and Electricity Ohm’s Law
Choose the correct form of Ohm’s law (J is current density, I is current, R is resistance, σ is conductivity and E is electric field).
1
J = σ/E
2
J = E/σ
3
V = R/I
4
J = σ E