Question

Earth has its own magnetic field around it. Then why the wire carring the electric current during any of the electrical praticals and during transsmission doesn't experience a force due to the magnetic field. (the answer canot be the weak magnetic field because if it would be so then the weakest comppass needle wouldn't align itself into a N-S position)

Answer 1

$$\begin{gathered} \mathrm{Current}\mathrm{carrying}\mathrm{wire}\mathrm{or}\mathrm{conductor}\mathrm{has}\mathrm{magnetic}\mathrm{field}\mathrm{developed}\mathrm{around}\mathrm{it},\mathrm{which} \\ \mathrm{intersects}\mathrm{the}\mathrm{magnetic}\mathrm{field}\mathrm{of}\mathrm{the}\mathrm{earth}.\mathrm{When}\mathrm{we}\mathrm{compare}\mathrm{the}\mathrm{magnetic}\mathrm{field} \\ \mathrm{of}\mathrm{the}\mathrm{earth}\mathrm{with}\mathrm{the}\mathrm{magnetic}\mathrm{field}\mathrm{developed}\mathrm{due}\mathrm{to}\mathrm{the}\mathrm{current}\mathrm{flowing}\mathrm{through} \\ \mathrm{the}\mathrm{conductor},\mathrm{then}\mathrm{out}\mathrm{of}\mathrm{these}\mathrm{two}\mathrm{fields},\mathrm{the}\mathrm{magnetic}\mathrm{field}\mathrm{of}\mathrm{conductor}\mathrm{is} \\ \mathrm{stronger}.\mathrm{So}\mathrm{the}\mathrm{conductor}\mathrm{carrying}\mathrm{current}\mathrm{is}\mathrm{not}\mathrm{deflected}. \end{gathered}$$