Question

A student has two resistors 2ohm and 3ohm. She has to put one of them in place of R2, as shown
in the circuit. The current that she needs in the entire circuit is exactly 9A. Show by calculation
which of the two resistors she should choose.​

Answer 1

Explanation:

The overall current needed = 9A. The voltage is 12V Hence by Ohm’s Law V=IR, The resistance for the entire circuit = 129129 = 43Ω43Ω = R R1 and R2 are in parallel. Hence, R=(R1R2)(R1+R2)(R1R2)(R1+R2)= 4R2(4+R2)4R2(4+R2)= 4343 R2 = 2ΩRead more on Sarthaks.com - https://www.sarthaks.com/972176/student-has-two-resistors-and-she-has-to-put-one-of-them-in-place-of-r2-as-shown-in-the-circuit

Answer 2

ʏᴏᴜʀ ᴀɴsᴡᴇʀ ɪɴ ᴀᴛᴛᴀᴄʜᴍᴇɴᴛ.