The figure shown is a plot of electric field lines due to two charges $Q_1$ and $Q_2.$ The sign of charges is

The figure shows electric field lines. If $E_A$ and $E_B$ are electric fields at $A$ and $B$ and distance $AB$ is $r,$ then

Charge $2 Q$ and $-Q$ are placed as shown in figure. The point at which electric field intensity is zero will be somewhere

Figure shows electric field lines due to a charge configuration, from this we conclude that

Six point charges are placed at the vertices of a hexagon of side $1 \mathrm{m}$ as shown in figure. Net electric field at the centre of the hexagon is

A proton and an $\alpha$ particle having equal kinetic energy are projected in a uniform transverse electric field as shown in figure