In the circuit shown in figure calculate and sketch the wave form of current $$'i'$$ over one period of the i/p voltages. Assume the diodes to be ideal

An ideal op-amp is used to make an inverting amplifier. The two input terminals of the op-amp are at the same potential because

The Circuit shown in figure is excited by the input wave form shown. Sketch the wave form of the output. Assume all the components are ideal

In the following circuit the output $$'V'$$ follows an equation of the form
$${{{d^2}V} \over {d{t^2}}} + a.{{dV} \over {dt}} + bV = f\left( t \right).$$
Find $$a,b$$ and $$f(t)$$