The resistance of the bulb filament is 
at a temperature of 
. If its temperature coefficient of resistance be 0.005 per 
, its resistance will become 
at a temperature
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
As the resistance of the bulb filament at 
is
where 
is its resistance at 
and α is the temperature coefficient of resistance.
and 
Dividing eqn. (i) by eqn. (ii), we get
Here,
or 
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
A battery of emf and internal resistance is connected to a resistor. The current in the circuit i…
The electron drift speed is small and the charge of the electron is also small but still, we obtain…
In the circuit shown, the value of I in ampere is
A lamp is to be operated on a 120 V D.C. line. For proper glow, a resistor of ohm should be connec…
A battery consists of a variable number (n) of identical cells, each having an internal resistance …
A current of enters one corner of an equilateral triangle having 3 wires of resistances each an…