Oxford PAT 2009, Questions 18 – 22

2009_page7

3 thoughts on “Oxford PAT 2009, Questions 18 – 22

      1. Thanks Thomas, that’s absolutely right.

        To add to this answer you can also say that initially the charge across the capacitor is 0, so the voltage across the capacitor is zero (because Q = VC). Previously the voltage across the (swapped out) resistor was greater than zero, so the voltage across the remaining resistor must have increased, and therefore the current has increased. As time goes by the voltage across the capacitor increases, and at some point this means that the voltage across the remaining resistor falls below the initial voltage and thus the current falls below the initial current.

Add your comments

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s