In the circuit above R is a resistor whose resistance increases with an increase in temperature. L1 and L2 are identical lamps. If the temperature of R increases
L1 becomes brighter and L2 becomes dimmer
L1 becomes brighter and L2 does not change
L2 becomes dimmer and L1 does not change
L1 becomes dimmer and L2 does not change
L1 and L2 becomes brighter
Explanation
Video Explanation
No video available
Post your Contribution
Discussions (14)
hmmmm!!!
I thought d answer is C,bcos dis is parallel connection,If d resistance,R, is increasing L1 is neither bright nor dimmer,but constant.
Let's analyze the circuit:
L1 and L2 are in parallel branches.
L2 is in series with resistor R, which increases resistance as temperature increases.
L1 is alone in its branch ā no resistor in series.
Now, when the temperature of R increases, the resistance of R increases, causing less current to flow through the branch with L2.
This means:
L2 gets less current, so it becomes dimmer.
More current is diverted to the L1 branch, so L1 becomes brighter.
So the correct answer is:
A. Lā becomes brighter and Lā becomes dimmer.
