true or false Immediately after the switch is closed, there is no current flowing through the resistor.

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13-07-2022
Physics

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true or false Immediately after the switch is closed, there is no current flowing through the resistor.

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ishikabhutani58 ishikabhutani58 · Answer 1 · 2022-07-20T07:33:43+02:00

True. Immediately after the switch is closed, current only flows through the capacitor and not through the resistor. This is because the resistor offers resistance to the current flow while the capacitor acts as a short in the circuit.

What is a RC circuit?

Consider the circuit diagram shown below. This circuit is known as an RC circuit. In an RC circuit:

The capacitor C is connected in parallel with resistor R and potential V.
When the switch is kept open, i.e. no potential is applied to the circuit for an extended period of time, the charge stored in the capacitor dissipates.
This leads to the current to stop flowing thorough the other components of the circuit.
Thus, when potential is applied across the capacitor (uncharged), the capacitor initially behaves as a closed wire and offers no resistance as the current flows through it whilst charging it.
Once the capacitor has been charged for a long period of time, it acts as a break in the circuit wherein no current can flow through it.
Now, when a switch is placed in the circuit, after the switch has been kept open for a long time, closing it causes the relative current and potential in the circuit to depend upon the state of charge in the capacitor at that instant.

Supposing that the capacitor has been kept uncharged for a long period of time, at this instant when the switch is closed, only the current flows through the capacitor and not through the resistor.

This is because the resistor offers resistance to current flow while the capacitor acts as a short in the circuit.

Learn more about RC circuits here:

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