Recent content by hellotheworld

Homework Statement For example : How to inverse z-domain function (z2+3z+7)/(z2+4z+3) The Attempt at a Solution Whatever I use partial fraction to simply the z-domain function, I cannot continue the next step, such as 1/(z+3)

x2 + y + y2dx - x dy = 0 Integrating factor, I(x,y) = -1 / (x2 + y2) How to find the integrating factor ?Why I cannot use below method to solve the ode ? (1/N)(My - Nx) = g(x) , I(x,y)=exp( ∫ g(x) dx) OR (1/M)(My - Nx) = h(y) , I(x,y)=exp( -∫ h(y) dy)

Thank you very much ! V remains constant since E is zero and there's no change in E-field (dV/dx = 0) inside the shell ?

Inside a charged sphere, the electric field strength is zero because there are electrostatic forces from all directions. I can't understand why electric potential inside the charged sphere is maximum ?