Two wires of the same metal have same length, but their cross‐sections are in the ratio 3: 1. They are joined in series. The resistance of thicker wire is 10 
. The total resistance of the combination will be
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Ratio of cross‐sectional areas of the wires 
and resistance of thick wire 
Resistance 
Therefore 
or 
and equivalent resistance of these two resistances in series combination
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 galvanometer having a coil resistance of 60 Ω Ω shows full scale deflection when a current of 1.0…
A student measures the terminal potential difference (V) of a cell (of emf ε and internal resistanc…
See the electrical circuit shown in this figure. Which of the following equations is a correct equa…
A thermocouple of negligible resistance produces an e.m.f. of 40 µV/°C in the linear range of tempe…
In the circuit shown in the figure, if potential at point A is taken to be zero the potential at po…
A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The…