किसी प्रायोगिक विद्युत परिपथ में धारा नियंत्रक (Rheostat) का मुख्य कार्य क्या होता है?

When checking a capacitor with an ohmmeter, the pointer initially deflects toward low resistance and then slowly returns toward an almost infinite resistance. If the pointer stops and stays at a relatively low resistance value (e.g., 50 kΩ), what does this indicate?

What does a symbol with a zig-zag line and an arrow passing diagonally through it denote in an electrical circuit diagram?