The ($\tau -\theta$) graph for a coil is
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(a) $\tau = NBiA\sin \theta $ so the graph between $\tau $ and $\theta $ is a sinusoidal graph.
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Statement $I:$ Biot-Savart's law gives us the expression for the magnetic field strength of an infinitesimal current element (IdI) of a current carrying conductor only.
Statement $II :$ Biot-Savart's law is analogous to Coulomb's inverse square law of charge $q$, with the former being related to the field produced by a scalar source, Idl while the latter being produced by a vector source, $q$. In light of above statements choose the most appropriate answer from the options given below: