Two proton beams going in the same direction repel each
other whereas two wires carrying currents in the same
direction attract each other. Explain.

Write two different vectors having same direction.

Can two isothermal curves intersect each other?

Prove that the lines which are parallel to the same line are parallel to each other.

Why two rowing boats moving parallel to each other come closer (attract) to each other ?

Two trains each of length 50m. are running with constant speeds on parallel tracks. While moving in same direction one over takes the other in 40 seconds and while moving in opposite direction on ecrosses the other in 20 seonds. The speeds of trains will be:-

Two vectors vecP and vecQ that are perpendicular to each other are :

Two field lines can never crosses each other because ,

Why don.t two magnetic field lines intersect each other ?