Answer :

(a) Magnetic field, concentric circles

(b) Bar magnet


(d) Turns, current, coil


(e) North pole


(f) South pole


Explanation: (a) a concentric circle is formed by the lines of a straight current carrying conductor.


(b) when current is passes through a solenoid it starts to act as a bar magnet.


(d) by increasing the no. of turns or increasing the flow of current or inserting the coil in a core the magnetic effect can be increased.


(e) north pole is the direction, if a coil is viewed from one end and the flow of current is in anticlockwise direction.


(f) when the current flow direction is clockwise when view from one end of the coil then that end is south pole.


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