An ac source of period t and maximum voltage v is connected to a single unknown ideal element that is either a resistor, and inductor, or a capacitor. at time t = 0 the voltage is zero. at time t = t/4 the current in the unknown element is equal to zero, and at time t = t/2 the current is i = -imax, where imax is the current amplitude. what is the unknown element?

This satisfy the above given condition so we can say that this capacitor.

Explanation:

Let's take one by one option and check whether is wrong or right

For inductor:

Given that at t=T/4 ,I=0 and we know that

So at T/4

I=0 A

At t=T/2

It means that this not a indutor.

For capacitor:

At T/4, I=0

At t=T/2

This satisfy the above given condition so we can say that this capacitor.

he . if i may ask what i your question exactly?

explanation: