A thin uniform wire AB of length 1 m
A potentiometer wire has a length of 10 m and resistance 4Ωm−1. An accumulator of emf 2V and a resistance box are connected in series with it. Culculate the resistance to be introduced in the box so as to get a potential gradient of (a) 0.1 V/m and (b) 0.1m Vm/s.
03
Sep
A potentiometer wire has a length of 10 m and resistance 4Ωm−1. An accumulator of emf 2V and a resistance box are connected in series with it. Culculate the resistance to be introduced in the box so as to get a potential gradient of (a) 0.1 V/m and (b) 0.1m Vm/s. A thin uniform wire [...]
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A thin uniform wire AB of length 1 m ,
an unknown resistance X and a resistance of 12Ω are connected by thick conducting strips ,
consisting of two resistors X and Y together in parallel with a meter long constantan wire of uniform cross section. Which the help of a movable contact D ,
Figure shows a meter bridge (which is nothing but a practical Wheatstone bridge) ,
if one decides to balance a resistance of 4 X against Y ,
In a meter bridge experiment null point is obtained at 20 cm. from one end of the wire when resistance X is balanced against another resistance Y. If XltY ,
then where will be the new position of the null point from the same end ,
Figure shows a potentiometer with a cell of emf 2.0 V and internal resistance 0.4Ω maintaining a potential drop across the resistor wire AB. A standard cell that maintains a constant emf of 1.02 V (for very moderate current up to emf μA) gives a balance point at 67.3 cm length of the wire. To ensure very low current is drawn the standard cell, a very high resistance of 600 kΩ is put in series with it, which is shorted close to the balance point. The standard cell is then replaced by a cell of unknown emf ε and the balance point found, similary, turns out to be at 82.3cm length of the wire. a. What is the value of ε? b.What purpose does the high resistance of 600kΩ have? c. Is the balance point affected by this high resistance? d. Is the balance point affected by internal resistance of the driver cell? e. Would the method work in the above situation if the driver cell of the potentiometer had an emf of 1.0V instead of 2.0V? f. Would the circuit work well for determining an extermely small emf, say of the order of a few mV (such as the typical emf of a thermocouple)? If not, how will you modify the circuit ?
03
Sep
Figure shows a potentiometer with a cell of emf 2.0 V and internal resistance 0.4Ω maintaining a potential drop across the resistor wire AB. A standard cell that maintains a constant emf of 1.02 V (for very moderate current up to emf μA) gives a balance point at 67.3 cm length of the wire. To [...]
Tags:
A thin uniform wire AB of length 1 m ,
an unknown resistance X and a resistance of 12Ω are connected by thick conducting strips ,
consisting of two resistors X and Y together in parallel with a meter long constantan wire of uniform cross section. Which the help of a movable contact D ,
Figure shows a meter bridge (which is nothing but a practical Wheatstone bridge) ,
if one decides to balance a resistance of 4 X against Y ,
In a meter bridge experiment null point is obtained at 20 cm. from one end of the wire when resistance X is balanced against another resistance Y. If XltY ,
then where will be the new position of the null point from the same end ,
Consider the potentiometer circuit as arranged in the figure (32−E29). The potentiometer wire is 600 cm long. (a) At what distance from the point A should the jockey touch the wire to get zero deflection in the galvanometer? (b) If the jockey touches the wire at a distance of 560 cm from A, what will be the current in the galvanometer?
03
Sep
Consider the potentiometer circuit as arranged in the figure (32−E29). The potentiometer wire is 600 cm long. (a) At what distance from the point A should the jockey touch the wire to get zero deflection in the galvanometer? (b) If the jockey touches the wire at a distance of 560 cm from A, what will [...]
Tags:
A thin uniform wire AB of length 1 m ,
an unknown resistance X and a resistance of 12Ω are connected by thick conducting strips ,
consisting of two resistors X and Y together in parallel with a meter long constantan wire of uniform cross section. Which the help of a movable contact D ,
Figure shows a meter bridge (which is nothing but a practical Wheatstone bridge) ,
if one decides to balance a resistance of 4 X against Y ,
In a meter bridge experiment null point is obtained at 20 cm. from one end of the wire when resistance X is balanced against another resistance Y. If XltY ,
then where will be the new position of the null point from the same end ,
A thin uniform wire AB of length 1 m, an unknown resistance X and a resistance of 12Ω are connected by thick conducting strips, as shown in the figure. A battery and a galvanometer (with a sliding jockey connected to it) are also available. Connections are to be made to measure the unknown resistance X. Using the principle of Wheatstone bridge answer the following questions : (a) Are there positive and negative terminals on the galvanometer? (b) Copy the figure in your answer book and show the battery and the galvanometer (with jockey connect at appropriate points. (c) After appropriate connections are made, it is found that no deflection takes place in th, from galvanometer when the sliding jockey touches the wire at a distance of 60 cm from A. Obtain value of the resistance X.
03
Sep
A thin uniform wire AB of length 1 m, an unknown resistance X and a resistance of 12Ω are connected by thick conducting strips, as shown in the figure. A battery and a galvanometer (with a sliding jockey connected to it) are also available. Connections are to be made to measure the unknown resistance X. [...]
Tags:
A thin uniform wire AB of length 1 m ,
an unknown resistance X and a resistance of 12Ω are connected by thick conducting strips ,
consisting of two resistors X and Y together in parallel with a meter long constantan wire of uniform cross section. Which the help of a movable contact D ,
Figure shows a meter bridge (which is nothing but a practical Wheatstone bridge) ,
if one decides to balance a resistance of 4 X against Y ,
In a meter bridge experiment null point is obtained at 20 cm. from one end of the wire when resistance X is balanced against another resistance Y. If XltY ,
then where will be the new position of the null point from the same end ,