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General
Easy
Question
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
The correct answer is:
Related Questions to study
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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?
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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
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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.
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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
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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
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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
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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
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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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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
physics-General
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In the circuit shown, the resistances are given in ohms and the battery is assumed ideal with emf equal to 3.0 volts. The resistor that dissipates the most power is
In the circuit shown, the resistances are given in ohms and the battery is assumed ideal with emf equal to 3.0 volts. The resistor that dissipates the most power is
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In the figure shown the power generated in y is maximum when y = 5. Then R is
In the figure shown the power generated in y is maximum when y = 5. Then R is
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The ratio of powers dissipatted respectively in R and 3R, as shown is:
The ratio of powers dissipatted respectively in R and 3R, as shown is:
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A person standing at a distance of 6 m from a source of sound receives sound wave in two ways, one directly from the source and other after reflection from a rigid boundary as shown in the figure. The maximum wavelength for which, the person will receive maximum sound intensity, is
A person standing at a distance of 6 m from a source of sound receives sound wave in two ways, one directly from the source and other after reflection from a rigid boundary as shown in the figure. The maximum wavelength for which, the person will receive maximum sound intensity, is
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A taut string at both ends vibrates in its nth overtone. The distance between adjacent Node and Antinode is found to be 'd'. If the length of the string is L, then
A taut string at both ends vibrates in its nth overtone. The distance between adjacent Node and Antinode is found to be 'd'. If the length of the string is L, then
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A wave pulse on a string has the dimension shown in figure. The waves speed is v = 1 cm/s. If point O is a free end. The shape of wave at time t = 3 s is :
A wave pulse on a string has the dimension shown in figure. The waves speed is v = 1 cm/s. If point O is a free end. The shape of wave at time t = 3 s is :
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