EASY
JEE Advanced
IMPORTANT
Earn 100

A potentiometer arrangement is shown in the figure. The driver cell has emf e and internal resistance r.

Question Image
The resistance of potentiometer wire AB is RF is the cell of emf e3 and internal resistance r3. Balance point (J) can be obtained for all finite values of

50% studentsanswered this correctly

Important Questions on Electrical Measuring Instruments

MEDIUM
JEE Advanced
IMPORTANT
When a galvanometer is shunted with a 4 Ω resistance, the deflection is reduced to 15. If the galvanometer is further shunted with a 2 Ω wire, the new deflection will be (assuming the main current remains the same),
EASY
JEE Advanced
IMPORTANT

Two cells A and B of electromotive forces 1.3 V and 1.5 V, respectively, are arranged as shown in the figure. The voltmeter (assumed ideal) reads 1.45 V, the internal resistances of cells A and B are rA and rB, respectively. Which of the following is correct?

Question Image

EASY
JEE Advanced
IMPORTANT
In the circuit shown in figure, the battery E1 has an emf of 12 V and zero internal resistance, while the battery E2 has an emf of 2 V. If the galvanometer G reads zero, then the value of the resistance Y is,
Question Image
MEDIUM
JEE Advanced
IMPORTANT
Two cells of emfs E1 and E2 and of negligible internal resistances are connected with two variable resistors as shown in the figure. When the galvanometer shows no deflection, the values of the resistances are P and Q. What is the value of the ratio E2/E1?
Question Image
MEDIUM
JEE Advanced
IMPORTANT

The Wheatstone's bridge shown in the figure is balanced. If the positions of the cell C and the galvanometer G are now interchanged, G will show zero deflection-
Question Image

MEDIUM
JEE Advanced
IMPORTANT
In the figure, two cells have equal emf E but internal resistances are r1 and r2. If the reading of the voltmeter is zero, then the relation between R, r1 and r2 is
Question Image
MEDIUM
JEE Advanced
IMPORTANT

A constant voltage dc source is connected, as shown in the figure, across two resistors of resistances 400  and 100 kΩ. What is the reading of the voltmeter, also of resistance 100 kΩ, when connected across the second resistor as shown?
Question Image

MEDIUM
JEE Advanced
IMPORTANT
In the given circuit (figure) in which case will the ammeter reading not change when R2 is varied?
Question Image