Question

a solenoid tends to contract when a current flows through it. Why?

Answer 1

The loops in a solenoid are arranged such that when current flows through them, theyflow parallel and in the same direction. If 2 wires have current flowing in the same direction, the wires attract each other.

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Answer 2

as the direction of current clearly explains that  when current moves in the direction as indicated the adjacent loop is carrying current  in the parallel direction and thus force due to 2 wires carrying current in the same direction is attractive thus a solenoid contracts when current is passing through it.
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