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A wire has a non-uniform cross-section as shown in figure. A steady current flows through it. The drift speed of electrons at points P and q is 
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The diagram besides shows a circuit used in an experiment to determine the emf and internal resistance of the cell C. A graph was plotted of the potential difference V between the terminals of the cell against the current I, which was varied by adjusting the rheostat. The graph is shown on the right ; x and y are the intercepts of the graph with the axes as shown. What is the internal resistance of the cell ?
The diagram besides shows a circuit used in an experiment to determine the emf and internal resistance of the cell C. A graph was plotted of the potential difference V between the terminals of the cell against the current I, which was varied by adjusting the rheostat. The graph is shown on the right ; x and y are the intercepts of the graph with the axes as shown. What is the internal resistance of the cell ?
physics-General
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In the arrangement shown in figure when the switch 
is open, the galvanometer shows no deflection for l = L/2. When the switch is closed, the galvanometer shows no deflection for l = 5L 12. The internal resistance (r) of 6 V cell, and the emf E of the other battery are respectively
In the arrangement shown in figure when the switch is open, the galvanometer shows no deflection for l = L/2. When the switch is closed, the galvanometer shows no deflection for l = 5L 12. The internal resistance (r) of 6 V cell, and the emf E of the other battery are respectively
physics-General
physics-
A battery of emf 
V is connected across a 4m long uniform wire having resistance 4 
/m. The cells of small emfs 
having internal resistance 2 and 6 respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to
A battery of emf V is connected across a 4m long uniform wire having resistance 4 /m. The cells of small emfs having internal resistance 2 and 6 respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to
physics-General
physics-
In the given potentiometer circuit length of the wire AB is 3 m and resistance is R = 4.5 . The length AC for no deflection in galvanometer is
In the given potentiometer circuit length of the wire AB is 3 m and resistance is R = 4.5 . The length AC for no deflection in galvanometer is
physics-General
physics-
An ammeter A of finite resistance, and a resistor R are joined in series to an ideal cell C. A potentiometer P is joined in parallel to R. The ammeter reading is I0 and the potentiometer reading is 
P is now replaced by a voltmeter of finite resistance. The ammeter reading now is I and the voltmeter reading is V
An ammeter A of finite resistance, and a resistor R are joined in series to an ideal cell C. A potentiometer P is joined in parallel to R. The ammeter reading is I0 and the potentiometer reading is P is now replaced by a voltmeter of finite resistance. The ammeter reading now is I and the voltmeter reading is V
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physics-
In the figure, the potentiometer wire AB of length L and resistance 9r is joined to the cell D of emf e and internal resistance r. The cell C’s emf is e/2 and its internal resistance is 2r. The galvanometer G will show no deflection when the length AJ is
In the figure, the potentiometer wire AB of length L and resistance 9r is joined to the cell D of emf e and internal resistance r. The cell C’s emf is e/2 and its internal resistance is 2r. The galvanometer G will show no deflection when the length AJ is
physics-General
physics-
The figure shows a metre-bridge circuit, with AB = 100 cm, X = 12 and R = 18 , and the jockey J in the position of balance. If R is now made 8 , through what distance will J have to be moved to obtain balance?
The figure shows a metre-bridge circuit, with AB = 100 cm, X = 12 and R = 18 , and the jockey J in the position of balance. If R is now made 8 , through what distance will J have to be moved to obtain balance?
physics-General
physics-
A 6 V battery of negligible internal resistance is connected across a uniform wire of length 1 m. The positive terminal of another battery of emf 4V and internal resistance 1 is joined to the point A as shown in figure. The ammeter shows zero deflection when the jockey touches the wire at the point C. The AC is equal to
A 6 V battery of negligible internal resistance is connected across a uniform wire of length 1 m. The positive terminal of another battery of emf 4V and internal resistance 1 is joined to the point A as shown in figure. The ammeter shows zero deflection when the jockey touches the wire at the point C. The AC is equal to
physics-General
physics-
In the figure shown for gives values of 
the balance point for Jockey is at 40 cm from A. When 
is shunted by a resistance of 10 , balance shifts to 50 cm. 
In the figure shown for gives values of the balance point for Jockey is at 40 cm from A. When is shunted by a resistance of 10 , balance shifts to 50 cm.
physics-General
physics-
A Wheatstone's bridge is balanced with a resistance of 625 in the third arm, where P, Q and S are in the 1st, 2nd and 4th arm respectively. If P and Q are interchanged, the resistance in the third arm has to be increased by 51 to secure balance. The unknown resistance in the fourth arm is
A Wheatstone's bridge is balanced with a resistance of 625 in the third arm, where P, Q and S are in the 1st, 2nd and 4th arm respectively. If P and Q are interchanged, the resistance in the third arm has to be increased by 51 to secure balance. The unknown resistance in the fourth arm is
physics-General
physics-
By error, a student places moving-coil voltmeter V (nearly ideal) in series with the resistance in a circuit in order to read the current, as shown. The voltmeter reading will be
By error, a student places moving-coil voltmeter V (nearly ideal) in series with the resistance in a circuit in order to read the current, as shown. The voltmeter reading will be
physics-General
physics-
In the circuit shown the resistance of voltmeter is 10,000 ohm and that of ammeter is 20 ohm. The ammeter reading is 0.10 Amp and voltmeter reading is 12 volt. Then R is equal to
In the circuit shown the resistance of voltmeter is 10,000 ohm and that of ammeter is 20 ohm. The ammeter reading is 0.10 Amp and voltmeter reading is 12 volt. Then R is equal to
physics-General
physics-
A milliammeter of range 10 mA and resistance 9 is joined in a circuit as shown. The metre gives full-scale deflection for current I when A and B are used as its terminals, i.e., current enters at A and leaves at B (C is left isolated). The value of I is
A milliammeter of range 10 mA and resistance 9 is joined in a circuit as shown. The metre gives full-scale deflection for current I when A and B are used as its terminals, i.e., current enters at A and leaves at B (C is left isolated). The value of I is
physics-General
physics-
In a galvanometer, the deflection becomes one half when the galvanometer is shunted by a 20 resistor. The galvanometer resistance is
In a galvanometer, the deflection becomes one half when the galvanometer is shunted by a 20 resistor. The galvanometer resistance is
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physics-
The variation of current (I) and voltage (V) is as shown in figure A. The variation of power P with current I is best shown by which of the following graph
The variation of current (I) and voltage (V) is as shown in figure A. The variation of power P with current I is best shown by which of the following graph
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