Two parallel conducting wires of equal length are placed distance 'd' apart, carry currents '$$\mathrm{I}_1$$' and '$$\mathrm{I}_2$$' respectively in opposite directions. The resultant magnetic field at the midpoint of the distance between both the wires is

Self inductance of a solenoid cannot be increased by

For a NAND gate, the inputs and outputs are given below.

The values taken by C, D, E, F are respectively

An electron and a proton having the same momenta enter perpendicularly into a magnetic field. What are their trajectories in the field?