Their is no such dependency on material of the core placed in the coil
When a current flows in a conducting material , it constitutes a magnetic field around it in a circular motion.
Magnetic field around a current-carrying coil of wire depend upon
a) Number of turns of wire in the coil as the number of turns increases
magnetic field also increases .(Directly proportional)
b) The thickness of the wire , as radius increases magnetic field decreases
(Inversely proportional)
c) current flowing through the conductor as magnitude of current increases magnetic field will also increase (directly proportional)
d) their is no such dependency on material of the core placed in the coil
hence correct answer option d)the material of the core placed in the coil
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