Capacitors are electronic components that store electrical energy. They are also known as condensers. They consist of two conductive plates that are separated by a dielectric material. When a voltage is applied to the capacitor, it stores electrical charge on the plates.


Capacitance is the ability of a capacitor to store electrical energy. It is defined as the ratio of the amount of charge stored on the plates to the voltage applied to the capacitor. The unit of capacitance is farad (F), which is a very large unit. In practice, capacitors are measured in microfarads (μF), nanofarads (nF), and picofarads (pF).


A variable radio capacitor is a type of capacitor that is used in radios and other electronic devices that require tuning. The capacitance of the capacitor can be changed by turning a dial. The dial is connected to a set of movable plates that can be adjusted to increase or decrease the capacitance.


The capacitance range of a variable radio capacitor depends on the design of the capacitor. In the given scenario, the capacitance of the capacitor can be changed from 50 picofarads to 950 picofarads by turning the dial from zero degrees to 180 degrees. This means that the capacitance can be changed by a factor of 19 (950/50).


Capacitors and capacitance are important concepts in electronics. Variable radio capacitors are commonly used in electronic devices that require tuning. The range of capacitance that can be achieved by a variable radio capacitor depends on the design of the capacitor. In the given scenario, the capacitance range is from 50 picofarads to 950 picofarads.