Respuesta :
The equivalent resistance of the combination is 15 ohm. Option C is correct.
What is resistance?
Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.
Case 1: Two 20 ohm resistors are connected in parallel;
[tex]\rm \frac{1}{R_{eq}_1} =\frac{1}{R_1} +\frac{1}{R_2} \\\\ \rm \frac{1}{R_{eq}_1} =\frac{1}{20} +\frac{1}{20} \\\\ R_{eq}_1}= 10 \ ohm[/tex]
Case 2: Two 10-ohm resistors are connected in parallel.
[tex]\rm \frac{1}{R_{eq}_2} =\frac{1}{R_1} +\frac{1}{R_2} \\\\ \rm \frac{1}{R_{eq}_2} =\frac{1}{10} +\frac{1}{10} \\\\ R_{eq}_2}= 5 \ ohm[/tex]
Case 3; Two combinations are connected in series.
[tex]\rm R= R_{eq_1}+R_{eq_2}\\\\ \rm R= 10+ 5 \\\\ R=15 \ ohm[/tex]
The equivalent resistance of the combination is 15 ohm.
Hence, option C is correct.
To learn more about the resistance refer to the link;
https://brainly.com/question/20708652
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