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Recent questions tagged current-electricity

Ohm's law is true

asked Mar 20, 2019 by meena.clay6

1 answer

If 5 percent of total current passes through a galvanometer of resistance G, then value of sheet resistance s is

asked Mar 20, 2019 by meena.clay6

1 answer

From Joules law of heating when current I flows through G. resistance R for time t. then Q produced is

asked Mar 20, 2019 by meena.clay6

1 answer

Kirchhoff's current law for a junction as shown

asked Mar 20, 2019 by meena.clay6

1 answer

n identical cells each of E and internal resistance r be connected in services The current through load resistance R

asked Mar 20, 2019 by meena.clay6

1 answer

Consider the following statements \[\] Statement 1: The electric bulb glows immediately when switch is turned on \[\] Statement 2: The drift velocity of electrons is very high in metallic conductors

asked Feb 16, 2014 by thanvigandhi_1

1 answer

Consider the following statements \[\] Statement 1: Voltmeter is much better than a potentiometer for measuring the emf of the cell \[\] Statement 2: A potentiometer draws no current while measuring the emf of the cell

asked Feb 16, 2014 by thanvigandhi_1

1 answer

Which of the following statements is false? \[\] The potential difference across the terminals of a non-ideal battery is

asked Feb 16, 2014 by thanvigandhi_1

1 answer

Two bulbs consume same power when operated at $200V\: and\: 300V$ respectively. When these bulbs are connected in series across a $DC$ supply of $500V$, then consider the following statements

asked Feb 16, 2014 by thanvigandhi_1

1 answer

Three wires of the same material are connected in parallel to a source of emf. Their lengths are in the ratio 1 : 2 : 3 and cross-sectional areas are in the ratio 2 : 4 : 1. Then, the ratio of power dissipated across them will be

asked Feb 16, 2014 by thanvigandhi_1

1 answer

Voltmeter reads the potential difference across the terminals of an old battery as $1.4V$ while a potentiometer reads it as $1.55V$. The voltmeter resistance is $280\; \text{ohms}$. Consider the following statements:

asked Feb 16, 2014 by thanvigandhi_1

1 answer

A battery of $emf\: E$ and internal resistance $ r$ is connected across a resistance $ R.\: R$ can be adjusted to any value greater than or equal to zero. A graph is plotted between the current through the resistance and the potential difference across it. Select the incorrect alternative

asked Feb 16, 2014 by thanvigandhi_1

1 answer

Which of the following is incorrect: \[\] When a potential difference is applied across, the current passing through

asked Feb 16, 2014 by thanvigandhi_1

1 answer

The electrochemical equivalent of a metal is $ 3.3 \times 10^{−7}$ at the cathode when a $3\: A$ current is passed for 2 seconds will be kg per coulomb. The mass of the metal liberated

asked Feb 16, 2014 by thanvigandhi_1

1 answer

Time taken by a $836\: W$ heater to heat one liter of water from $10^{\circ}C\: to\: 40^{\circ}C$ is

asked Feb 16, 2014 by thanvigandhi_1

1 answer

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 $ X < Y$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4$X$ against $Y$?

asked Feb 16, 2014 by thanvigandhi_1

1 answer

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the length and radii of the wires are in the ratio of $ \large\frac{4}{3} \: and \:\large\frac{2}{3}$, then the ratio of the currents passing through the wires will be

asked Feb 16, 2014 by thanvigandhi_1

1 answer

The resistance of the series combination of two resistances is $S$. When they are joined in parallel through total resistance is $P$. If $S = nP$, then the minimum possible value of $n$ is

asked Feb 16, 2014 by thanvigandhi_1

1 answer

The total current supplied by the battery is

asked Feb 16, 2014 by thanvigandhi_1

1 answer

Alternating current cannot be measured by $DC$ ammeter because

asked Feb 16, 2014 by thanvigandhi_1

1 answer

The resistance of a wire is $5\: ohm \: at\: 50^{\circ}C$ and $6\: ohm \: at\: 100^{\circ}C$. The resistance of the wire at $0^{\circ}C$ will be

asked Feb 16, 2014 by thanvigandhi_1

1 answer

A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be

asked Feb 16, 2014 by thanvigandhi_1

1 answer

An electric bulb is rated $220V$- $100W$. The power consumed by it when it operates on $110V$ is

asked Feb 16, 2014 by thanvigandhi_1

1 answer

The resistance of a bulb filament is $ 100\Omega$ at a temperature of $100^{\circ}C$. If its temperature coefficient of resistance be $0.005 \: per^{\circ}C$ its resistance will become $200\Omega$ at a temperature of

asked Feb 15, 2014 by thanvigandhi_1

1 answer

In a Wheatstone's bridge their resistances P, Q and R connected in the three arms and the fourth arm is formed by the two resistances $S_1\: and \: S_2$ connected in parallel. The condition for bridge to be balanced will be

asked Feb 15, 2014 by thanvigandhi_1

1 answer

The Kirchhoff’s first law $ (\sum i = 0)$ and second law $(\sum iR = \sum E)$ where symbols have their usual meanings, are respectively based on conservation of

asked Feb 15, 2014 by thanvigandhi_1

1 answer

A material B has twice the specific resistance of A. A circular wire made of B has twice the diameter of a wire made of A. Then for the two wires to have the same resistance, the ratio $ \large\frac{l_A}{l_b}$ of their respective lengths must be

asked Feb 15, 2014 by thanvigandhi_1

1 answer

The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100W and 200V lamp when not in use?

asked Feb 15, 2014 by thanvigandhi_1

1 answer

In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of $ 2 \Omega$ the balancing length becomes 120 cm. The internal resistance of the cell is

asked Feb 15, 2014 by thanvigandhi_1

1 answer

An energy source will supply a constant current into the loads of its internal resistance is

asked Feb 15, 2014 by thanvigandhi_1

1 answer

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

asked Feb 15, 2014 by thanvigandhi_1

1 answer

Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are $R_1\: and \: R_2 (R_2 > R_1)$. If the potential difference across the source having internal resistance $R_2$ is zero then,

asked Feb 15, 2014 by thanvigandhi_1

1 answer

In the circuit the galvanometer $G$ shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor $R$ will be

asked Feb 15, 2014 by thanvigandhi_1

1 answer

Two voltameters one of copper and other of silver, are joined in parallel. When a total charge $q$ flows through a voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are $z_1\: and \: z_2$ respectively the charge which flows through the silver voltameter is

asked Feb 15, 2014 by thanvigandhi_1

1 answer

A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be

asked Feb 15, 2014 by thanvigandhi_1

1 answer

What is the dimensional formula for capacitance?

asked Feb 15, 2014 by thanvigandhi_1

1 answer

What is the dimensional formula for resistivity?

asked Feb 15, 2014 by thanvigandhi_1

1 answer

A 5V battery with internal resistance $2\Omega$ and a 2V battery with internal resistance $1\Omega$ are connected to a $ 10 \Omega $ resistor as shown in the figure. The current in the $ 10\Omega $ resistor is

asked Feb 15, 2014 by thanvigandhi_1

1 answer

Consider a block of conducting material of resistivity $ \rho$ shown in the figure. Current I enters at A and leaves from D. We apply superposition principle to find voltage $ \Delta V$ developed between B and C. The calculation is done in the following steps. \[\] (i) Take current I entering from A and assume it to spread over a hemispherical surface in the block. \[\] Calculate field E(r) at distance r from A by using ohm's law $E= \rho j$, where j is the current per unit area at r. \[\] (iii) From the r dependence of E(r) obtain the potential V(r) at r. \[\] (iv) Repeat (i), (ii) and (iii) for current I leaving D and superpose results for A and D \[\] For current entering at A, the electric field at a distance r from A is

asked Feb 14, 2014 by thanvigandhi_1

1 answer

Consider a block of conducting material of resistivity $ \rho$ shown in the figure. Current I enters at A and leaves from D. Apply the superposition principle and find the voltage $ \Delta V$ developed between B and C?

asked Feb 14, 2014 by thanvigandhi_1

1 answer

Shown in the figure below is a meter-bridge setup with null deflection in the galvanometer.The value of the unknown resistor $R$ is

asked Feb 14, 2014 by thanvigandhi_1

1 answer

Calculate the effective resistance between points A and B

asked Feb 14, 2014 by thanvigandhi_1

1 answer

What is the average drift speed of conduction electrons in a copper wire of cross-sectional area $1.0 \times 10^{–7}m^2$ carrying a current of $1.5 A$. Assume that each copper atom contributes roughly one conduction electron. The density of copper is $ 9.0 \times 10^3 kg/m^3 $ , and its atomic mass is $ 63.5 u.$

asked Feb 14, 2014 by thanvigandhi_1

1 answer

At what temperature would the temperature of a copper conductor be double its value at $0^{\circ}C\: \alpha_{Cu} = 4 \times 10^{-3}$

asked Feb 14, 2014 by thanvigandhi_1

1 answer

Which of the following is an example of ohmic conductor:

asked Feb 14, 2014 by thanvigandhi_1

1 answer

The current in the primary circuit of a potentiometer is $0.2 A$. The specific resistance and cross-section of the potentiometer wire are $4 \times 10^{-7} ohm $ meter and $8 \times 10^{-7} \: m^2$ respectively. The potential gradient will be equal to:

asked Feb 13, 2014 by thanvigandhi_1

1 answer

If $400ohms $ of resistance is made by adding four $ 100 \: ohm $ resistances of tolerance 5%, then the tolerance of the combination is:

asked Feb 13, 2014 by thanvigandhi_1

1 answer

The potential difference across the terminals of the battery (with $2\;ohms$ internal resistance) is

asked Feb 13, 2014 by thanvigandhi_1

1 answer

The current passing through the $ 3\Omega$ resistor is

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Under what conditions, can the current passing through the resistance R be increased? r1 and r2 are the internal resistances of the two batteries.

asked Feb 13, 2014 by thanvigandhi_1

1 answer

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