Force Between Two Parallel Current Carrying Conductors - Practice Questions & MCQ

Two long conductors, separated by a distance d carry current $I_1$ and $I_2$   in the same direction. They exert a force F on each other Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to 3d. The new value of the force between them is

Two thin long, parallel wires, separated by a distance d carry a current of  i  A in the same direction. They will

Two long straight parallel wires, carrying (adjustable) currents I₁ and I₂, are kept at a distance d apart. If the force ‘F’ between the two wires is taken as ‘positive’ when the wires repel each other and ‘negative’ when the wires attract each other, the graph showing the dependence of ‘F’, on the product  I₁I₂,  would be :

Two concentric coils each of radius equal to $2\pi \mathrm{cm}$ are placed at right angles to each other. 3 A and 4 A are the currents flowing in each coil, respectively. The magnetic induction in $\mathrm{Wb}/{\mathrm{m}}^2$ at the centre of the coils will be:
$({\mu }_0=4\pi \times {10}^{-7}\mathrm{Wb}/\mathrm{A}-\mathrm{m})$

A and B are two conductors carrying a current i in the same direction. x and y are two electron beams moving in the same direction

Two long wires are hanging freely. They are joined first in parallel and then in series and then are connected with a battery. In both cases, which type of force acts between the two wires