Q7. Which of the following circuits cannot be used to measure the resistance of resistor R?
(a)
A
R

Q: What is the correct answer for CUET UG Physics Q7?

The correct answer is c. To measure resistance R using Ohm's Law (R=V/I), we need to accurately measure the voltage (V) across the resistor and the current (I) flowing through it. An ammeter (A) must be connected in series with the resistor to measure current, and it should have very low internal resistance. A voltmeter (V) must be connected in parallel across the resistor to measure voltage, and it should have very high

Q: Q7. Which of the following circuits cannot be used to measure the resistance of resistor R? (a) A R V (b) A wwwwwwww R (c) A R wwwwwww V (d) wwwwww R A

The correct answer is c. To measure resistance R using Ohm's Law (R=V/I), we need to accurately measure the voltage (V) across the resistor and the current (I) flowing through it. An ammeter (A) must be connected in series with the resistor to measure current, and it should have very low internal resistance. A voltmeter (V) must be connected in parallel across the resistor to measure voltage, and it should have very high

Q: What are the options for this CUET UG Physics question?

A. Circuit (a) · B. Circuit (b) · C. Circuit (c) · D. Circuit (d)

Question

Q7. Which of the following circuits cannot be used to measure the resistance of resistor R?
(a)
A
R
V
(b)
A
wwwwwwww
R
(c)
A
R
wwwwwww
V
(d)
wwwwww
R
A

FirstInTest · Accepted Answer

To measure resistance R using Ohm's Law (R=V/I), we need to accurately measure the voltage (V) across the resistor and the current (I) flowing through it. An ammeter (A) must be connected in series with the resistor to measure current, and it should have very low internal resistance. A voltmeter (V) must be connected in parallel across the resistor to measure voltage, and it should have very high internal resistance. Circuit (a) and (b) are standard correct methods for measuring resistance using an ammeter and voltmeter. Circuit (d) shows an ammeter in parallel with R, which would short-circuit R and measure current incorrectly. Circuit (c) shows a voltmeter connected in series with the resistor R. Since a voltmeter has a very high internal resistance, placing it in series would add significant resistance to the circuit, drastically reducing the current (potentially to almost zero) through R. This would make it impossible to get an accurate measurement of the current through R, and consequently, its resistance cannot be measured correctly. Therefore, circuit (c) cannot be used to measure the resistance of resistor R.

Answer

Circuit (a)

Answer

Circuit (b)

Answer

Circuit (c)

Answer

Circuit (d)

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