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user16266657
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Why must we follow the formula of potential $V$ if we want to calculate the charge, instead of following the formula of electric field
Mar 21, 2023
1
Why is $dq=\rho_s a d\theta 2 \pi a \sin\theta $ in the semi-sphere?and $E_z=\int^{\frac{\pi}{2}}_0dE_z$ not $\int^{\frac{\pi}{2}}_0$? [closed]
Mar 5, 2023
1
Why can we just plus two charge directly if they don't connect each other by a wire?
Mar 23, 2023
0
Why can we just write $\cdot [\vec u_RdR+\vec u_\theta Rd\theta] $ to describe this irregular path?
Feb 3, 2023
0
Why can the current be written as $I_{in}=I-I\frac{r^2-b^2}{c^2-b^2}$? [closed]
Apr 30, 2023
0
Why must we use the method of image to calculate the surface charge density? [closed]
May 16, 2023
0
Why can the current in this region be represented as this formula?$I_{in}=I-I\frac{r^2-b^2}{c^2-b^2}$ [closed]
Oct 7, 2023