# An uncharged series RC circuit is to be connected across a battery.For each of the following changes, determine whetherthe time for the capacitor to reach 90% of its final chargewould increase, decrease, or remain unchanged. Indicateyour answers with “I,” “D,” or “U,” respectively. (a) The RCtime constant τ is doubled. (b) The battery voltage is doubled.(c) A second resistor is added in series with the original resistor.

Question
1 views

An uncharged series RC circuit is to be connected across a battery.
For each of the following changes, determine whether
the time for the capacitor to reach 90% of its final charge
would increase, decrease, or remain unchanged. Indicate
time constant τ is doubled. (b) The battery voltage is doubled.
(c) A second resistor is added in series with the original resistor.

check_circle

Step 1

a)

Write the equation for charge at instant time

Step 2

As the time constant is doubled, required time is also increased. Thus the answer is “I”

Step 3

b)

Voltage and time is not dependent to each other. Thus th...

### Want to see the full answer?

See Solution

#### Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in