Wheatstone Bridge
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Q.
In the given circuit of potentiometer, the potential difference E across AB ( length) is larger than and as well. For key (closed), the jockey is adjusted to touch the wire at point so that there is no deflection in the galvanometer. Now the first battery () is replaced by the second battery () for working by making open and closed. The galvanometer gives then null deflection at . The value of is the smallest fraction of , Then the value of is ____.
Q. A parallel plate capacitor is made by stacking n equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is C, then the resultant capacitance is
- nC
- nC
- (n+1)C
- (n−1)C
Q. The figure shows a circuit diagram of a ‘Wheatstone Bridge’ to measure the resistance G of the galvanometer. The relation PQ=RG will be satisfied only when
- The galvanometer shows a deflection when switch S is closed
- The galvanometer shows a deflection when switch S is open
- The galvanometer shows no change in deflection whether S is open or closed
- The galvanometer shows no deflection
Q. Find the resistance of the circuit shown below figure between points A and D.
- 5RΩ
- 5R2Ω
- RΩ
- 2R3Ω
Q. A cell of emf ε & and internal resistance r is connected across circuit as given in figure. For what value of R heat generated in outer circuit is maximum, ε=10 V & r=103Ω
- R=5 Ω
- R=3 Ω
- R=10 Ω
- Heat generated is independent of R
Q. In the metre bridge arrangement, an unknown resistance R1 is connected in series with resistance of 10 Ω. When the combination is connecetd to left gap of the meter bridge and R2 is connected to right gap, balance point from left end is at 50 cm. When 10 Ω resistor is removed, the balance point shifts to 40 cm. The value of R1 is
- 20 Ω
- 10 Ω
- 60 Ω
- 40 Ω
Q. The figure shows a circuit diagram of a ‘Wheatstone Bridge’ to measure the resistance G of the galvanometer. The relation PQ=RG will be satisfied only when
- The galvanometer shows a deflection when switch S is closed
- The galvanometer shows a deflection when switch S is open
- The galvanometer shows no change in deflection whether S is open or closed
- The galvanometer shows no deflection
Q. Find the equivalent capacitance between A and B for this infinite circuit of capacitors.
- (√5−1)C2
- (√5+1)C2
- (1−√5)C2
- None of these
Q. For the circuit shown in the figure, choose the correct options.
- The potential difference across resistor R is equal to 20 V
- The current through 10 Ω resistor connected across NP is 0.5 A
- The value of R1=50 Ω
- The value of R=14 Ω
Q. The condition such that the potential difference, VA−VB=0 is .
- R1R2=R4R3
- R1R3=R4R2
- R1R2=R3R4
Q. Four resistances P, Q, R, X formed wheat stone bridge. The bridge is balanced when R=64Ω. If P and Q are inter changed to bridge is balanced for R=144Ω. The value of ‘X’ is
- 300Ω
- 200Ω
- 110Ω
- 96Ω
Q.
In the given circuit, it is observed that the current I is independent of the value of the resistance R6. Then the resistance values must satisfy
(IIT-JEE 2001)
R1R2R5=R3R4R6
1R5+1R6=1R1+R2+1R3+R4
R1R4=R2R3
R1R3=R2R4=R5R6
Q.
For given combination of capacitor where each capacitance is C
Equivalent capacitance of the system is
For given combination of capacitor where each capacitance is C
Equivalent capacitance of the system is
- 3833
- 3532
- 3835
- 3338
Q. For the circuit shown in the figure, choose the correct options.
- The value of R1=50 Ω
- The current through 10 Ω resistor connected across NP is 0.5 A
- The value of R=14 Ω
- The potential difference across resistor R is equal to 20 V
Q.
Find I
- 3A
- 23A
- 4A
- 133A