4(e)
The diagram alongside shows a loop of wire carrying current I:
(i) What is the magnetic polarity of the loop that faces us?
(ii) With respect to the diagram how can we increase the strength of the magnetic field produced by this loop?
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(i) The magnetic polarity of the loop that faces us is south pole as the current is in clockwise direction.
(ii) We can increase the strength of the magnetic field produced by this loop by decreasing the value of variable resistance which in turn will increase the current I in the circuit.