Question
Is it possible for a current loop to stay without rotating in a uniform magnetic field? If yes, what should be the orientation of the loop?
✓
Answer
Angle must be $\theta=0^\circ$ or $180^\circ$ between magnetic field and magnetic moment.
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Answer the following:
What are the forms of energy into which the electrical energy of the atmosphere is dissipated during a lightning? $($Hint: The earth has an electric field of about $100Vm^{–1}$ at its surface in the downward direction, corresponding to a surface charge density $= –10^{–9}Cm^{–2}$. Due to the slight conductivity of the atmosphere up to about $50\ km \ ($beyond which it is good conductor$),$ about $+ 1800C$ is pumped every second into the earth as a whole. The earth, however, does not get discharged since thunderstorms and lightning occurring continually all over the globe pump an equal amount of negative charge on the earth.$)$
→What are the forms of energy into which the electrical energy of the atmosphere is dissipated during a lightning? $($Hint: The earth has an electric field of about $100Vm^{–1}$ at its surface in the downward direction, corresponding to a surface charge density $= –10^{–9}Cm^{–2}$. Due to the slight conductivity of the atmosphere up to about $50\ km \ ($beyond which it is good conductor$),$ about $+ 1800C$ is pumped every second into the earth as a whole. The earth, however, does not get discharged since thunderstorms and lightning occurring continually all over the globe pump an equal amount of negative charge on the earth.$)$