Physics-
General
Easy
Question
The length of a potentiometer wire is l. A cell of emf E is balanced at a length l/3 from the positive end of the wire. If the length of the wire is increased by l/2. At what distance will the same cell give a balance point
The correct answer is:
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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 R1 and R2 the balance point for Jockey is at 40 cm from A. When R2 is shunted by a resistance of 10 , balance shifts to 50 cm. R1 and R2 are (AB = 1 m):
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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 i
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 i
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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
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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
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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
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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
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What amount of heat will be generated in a coil of resistance R due to a charge q passing through it if the current in the coil decreases to zero uniformly during a time interval 
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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
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The ratio of powers dissipatted respectively in R and 3R, as shown is:
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In the circuit shown the cells are ideal and of equal emfs, the capacitance of the capacitor is C and the resistance of the resistor is R. X is first joined to Y and then to Z. After a long time, the total heat produced in the resistor will be
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A total charge Q flows across a resistor R during a time interval = T in such a way that the current vs. time graph for 
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physics-General
