A bulb and a capacitor are connected in series to an a.c. source of variable frequency. How will the brightness of the bulb change on increasing the frequency of a.c. source ?

Explanation

To solve the problem of how the brightness of the bulb changes when the frequency of the AC source is increased, we can follow these steps:

### Step 1: Understand the Circuit Configuration
In this circuit, we have a bulb (which acts as a resistive load) and a capacitor connected in series to an AC source.

**Hint:** Remember that in an AC circuit, the behavior of components like resistors and capacitors changes with frequency.

### Step 2: Identify the Relationship Between Capacitive Reactance and Frequency
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