42 - Magnetism Questions Answers

$$\begin{gathered} Magnetic torque = \overrightarrow{M}\times \overrightarrow{B}=i\overrightarrow{A}\times \overrightarrow{B} \\ Torque due to gravity about the point of \\ circumference = \overrightarrow{R}\times m\overrightarrow{g} \\ Now compare the two \end{gathered}$$Inform for any issue

$$\begin{gathered} X_C=50\Omega and X_L=100\Omega are in parallel. \\ Resul\tan t is 100\Omega capaci\tan ce. \\ Now 100\Omega capaci\tan ce and 100\Omega induc\tan ce give reac\tan ce 0\Omega \\ and resis\tan ce is 100\Omega . So only option D is correct. \end{gathered}$$

the resultant dipole moment is √2M  thus  the resultant magnetic  field is  μ2√2M/4πd³   (ans)

method given by BONEY is correct but formula is not correct

it should be B = 4×{ (μ₀I) / 4πR } × [sinθ₁+ Sinθ₂]