MEDIUM
12th ICSE
IMPORTANT
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Calculate the currents I1,I2 and I3 in the given The cells have negligible internal resistances.

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Important Questions on DC Circuits and Measurements

HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 38
In determining the resistance of a given wire with the help of metre bridge, the null-point is obtained at a distance of 40 cm on taking out 2 Ω  resistance from the resistance box. What is the resistance of the wire? To obtain the null-point at a distance of 60 cm, how much resistance in ohm, will have to be taken out from the resistance box?
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 39

In figure, AB is a potentiometer wire of length 100 cm. The cell of emf 3 V has a negligible internal resistance. What is the reading in voltmeter V, if BC is equal to 70 cm?

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HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 40
A 3 V battery of internal resistance 1 Ω is joined to a sliding wire of length 100 cm and resistance 5 Ω. A voltmeter, which takes negligible current, is connected across 60 cm length of the wire, What is the reading of the voltmeter?
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 40
A 3 V battery of internal resistance 1 Ω is joined to a sliding wire of length 100 cm and resistance 5 Ω. A voltmeter, which takes negligible current, is connected across 60 cm length of the wire, if the resistance of the voltmeter were 150 Ω, then what would have its reading?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 41
Potential difference across a potentiometer wire of length 4 m is 2 V. Calculate the potential gradient of the potentiometer.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 42
A 10 m long potentiometer wire has a potential gradient of 0.0025 V/cm along its length. Calculate the length of the wire at which null-point is obtained for a 1.025 V standard cell. Also, find the emf of another cell for which the null-point is obtained at 860 cm length. What maximum PD can be measured by this potentiometer?
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 43
A potentiometer is being used to compare two resistances. The balancing length for a standard resistor R=10.0 Ω is 58.3 cm, while that for an unknown resistance X is 68.5 cm. Determine the value of X. What would you do if you failed to find a null-point on the potentiometer wire AB?
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 44
A cell gives a balance with 85 cm of a potentiometer wire. When the terminals of the cell are shorted through a resistance of 7.5 Ω a balance is obtained at 75 cm. Find the internal resistance of the cell.