Question

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why the magnetic effect is greater in the circular coils but now in the straight line i want it with the reasons.

Answer 1

A current through any conductor creates a circular magnetic field around the conductor due to Ampere's law. The advantage of using a coil shape is that it increases the strength of magnetic field produced by a given current. The magnetic fields generated by the separate turns of wire all pass through the same center of the coil and superpose to produce a stronger field there.The more turns of wire, the stronger the field produced. A changing external magnetic flux induces a voltage in a conductor such as a wire, due to Faraday's law of induction. The induced voltage can be increased by winding the wire into a coil, because the field lines intersect the circuit multiple times. This is why a coil shows better inductance than a straight. See dependencey of coefficient of induction (L) and coefficient of mutual induction (M) on shape and dimensions of the current carrying wire.