Recent questions tagged current-electricity

Find the resistance of the wire frame shaped as a cube when measured between the points 1 and 7. The resistance of each edge is R

asked Feb 8, 2014 by thanvigandhi_1

1 answer

Two capacitors $C_1$ and $C_2$ are charged to $120\: V$ and $ 200\: V$ respectively. It is found that by connecting them together the potential on each one can be made zero. Then:

asked Feb 8, 2014 by thanvigandhi_1

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This question has statement I and statement II. Of the four choices given after the statements, choose the one that best describes the two statements. \[\] Statement- I: Higher the range, greater is the resistance of ammeter. \[\] Statement- II: To increase the range of ammeter, additional shunt needs to be used across it.

asked Feb 8, 2014 by thanvigandhi_1

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The supply voltage to a room is $120\: V\: DC$. The resistance of the lead wires is $6 \Omega$. A $60\: W$ bulb is already switched on. What is the decrease of voltage across the bulb, when a $240\: W$ heater is switched on in parallel to the bulb?

asked Feb 8, 2014 by thanvigandhi_1

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Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is

asked Feb 8, 2014 by thanvigandhi_1

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Two electric bulbs marked $25W – 220V$ and $100W – 220V$ are connected in series to a $440V$ supply. Which of the bulbs will fuse?

asked Feb 8, 2014 by thanvigandhi_1

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A resistance of $2 \Omega$ is connected across one gap of a meter-bridge and an unknown resistance, greater than $2 \Omega$, is connected across the other gap. When these resistances are interchanged, the balance point shifts by $20cm$. The unknown resistance is

asked Feb 8, 2014 by thanvigandhi_1

1 answer

A moving coil galvanometer of resistance $100 \Omega$ is used as an ammeter using a resistance of $ 0.1 \Omega$. The maximum deflection current in the galvanometer is $100 \mu A$. Find the current in the circuit so that the ammeter shows full scale deflection

asked Feb 8, 2014 by thanvigandhi_1

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A rigid container with thermally insulated walls contains a coil of $100 \Omega$ resistance with a current of $1A$. Change in internal energy after 5 min will be

asked Feb 8, 2014 by thanvigandhi_1

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A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor are

asked Feb 8, 2014 by thanvigandhi_1

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A wire of length $L$ and $3$ identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by $ \Delta T$ in a time $t$. A number $N$ of similar cells are now connected in series with a wire of the same material and cross-section but of length $2L$. The temperature is raised by the same amount $ \Delta T$ in the same time. The value of $N$ is

asked Feb 8, 2014 by thanvigandhi_1

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In steady state, a resistor is carrying a current $i$. The power lost to the surroundings is $b(T- T_0)$. Here $b$ is a constant, $T$ is the temperature of the resistance and $T_0$ is the surrounding temperature. If the coefficient of linear expansion is $ \alpha$. The strain in the wire is

asked Feb 8, 2014 by thanvigandhi_1

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The length of the potentiometer wire is l. A cell of emf E is balanced at length $ \large\frac{l}{3}$ from the positive end of the wire. If the length of the wire is increased by $ \large\frac{l}{2}$, at what distance will the same cell give a balance point

asked Feb 8, 2014 by thanvigandhi_1

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Two wires of resistivity $\rho 1$ and $ \rho 2$ are connected in parallel. Equivalent resistivity of the combination is

asked Feb 8, 2014 by thanvigandhi_1

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Two wires of resistivity $\rho 1$ and $\rho 2$ are connected in series. Equivalent resistivity of the combination is

asked Feb 6, 2014 by thanvigandhi_1

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The potential difference across the terminals of a battery is 10V when there is a current of 3A in the battery from the negative to the positive terminal. When the current is 2A in the reverse direction, the potential difference becomes 15V. The internal resistance of battery is

asked Feb 6, 2014 by thanvigandhi_1

1 answer

Which of the following has the maximum resistance?

asked Feb 6, 2014 by thanvigandhi_1

1 answer

Two identical batteries having emf 2.4 V and internal resistance 0.5$ \Omega$ are connected as shown. Potential Difference between A and B is

asked Feb 6, 2014 by thanvigandhi_1

1 answer

Current through the 2$ \Omega$ resistor is

asked Feb 6, 2014 by thanvigandhi_1

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A piece of copper and another of silicon are cooled from room temperature to 75K. The resistance of

asked Feb 6, 2014 by thanvigandhi_1

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In the adjoining infinite circuit, what is the effective resistance as seen by the battery

asked Feb 5, 2014 by thanvigandhi_1

1 answer

To double the full scale reading of any galvanometer turned into a voltmeter, you must

asked Feb 5, 2014 by thanvigandhi_1

1 answer

The value of each of the resistors is R. The equivalent resistance between A and B is

asked Feb 5, 2014 by thanvigandhi_1

1 answer

Thirteen resistors each of resistance R are connected in the circuit as shown. What sis the effective resistance between A and B?

asked Feb 4, 2014 by thanvigandhi_1

1 answer

The equivalent resistance between the points A and B is

asked Feb 4, 2014 by thanvigandhi_1

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In the given circuit, the current through the battery is independent of $R_6$. Then which of these relation holds

asked Feb 3, 2014 by thanvigandhi_1

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The equivalent resistance between the terminals A and D of the following circuit is:

asked Feb 3, 2014 by thanvigandhi_1

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A metallic wire of resistance 12$ \Omega $ is bent to form a square. The effective resistance between two diagonal points would be

asked Feb 3, 2014 by thanvigandhi_1

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In the circuit shown, the steady state potential drop across the capacitor must be

asked Feb 3, 2014 by thanvigandhi_1

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In the circuit shown, the current passing through the:

asked Feb 3, 2014 by thanvigandhi_1

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As the temperature of the conductor increases, the ratio of resistivity to conductivity

asked Feb 3, 2014 by thanvigandhi_1

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Which of the following quantity associated with the resistor, does not change with temperature

asked Feb 3, 2014 by thanvigandhi_1

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The net resistance of a voltmeter should be large to ensure that

asked Feb 3, 2014 by thanvigandhi_1

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The net resistance of an ammeter should be small to ensure that

asked Feb 3, 2014 by thanvigandhi_1

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In an electric circuit containing a battery, the charge (positive by convention) inside the battery

asked Feb 3, 2014 by thanvigandhi_1

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