Explanation
Magnetic field due to solenoid is independent of diameter [Because B = μ0ni]
At midpoint, magnetic fields due to both the wires are equal and opposite. So,BNet = 0.
Force acts perpendicular to the velocity in a magnetic field, so speed of electron will remain same.
According to Fleming’s left hand rule, in figures (1) and (2) magnetic force on the electron will be directed in –ve z-axis and –ve x-axis respectively. In figure (3) velocity of electron and direction of magnetic field are antiparallel, so no force will act on electron.
Magnetic force on electron = Bev sin θ
= Bev sin 0 = zero
Electron will not be deflected due to magnetic field.
Electric force on electron = Ee
This force is opposite to direction of motion of the electron. The speed of electron will decrease.
Hence the electron will not be deflected but its speed is decreased.
By Fleming's left hand rule.
Magnetic field produced by wire at the location of charge is perpendicular to the paper inwards. Hence by applying Fleming’s left hand rule, force is directed along OY.
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