Email

Chat with tutors

Login

Ask Questions, Get Answers

X

Questions >> JEEMAIN and NEET >> Physics >> Class12 >> Current Electricity

In the circuit shown in the figure, reading of the voltmeter is V1 when only S1 is closed, V2 when only S2 is closed and V3 when both S1 and S2 are closed. Then

asked Feb 13, 2014 by thanvigandhi_1

1 answer

When no current passes through a conductor

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Suppose you have three variable resistors each of range 15 ohms to 30 ohms. Which of the following values of equivalent resistance cannot be obtained using these 3 variable resistors?

asked Feb 13, 2014 by thanvigandhi_1

1 answer

A uniform wire of resistance $100\: ohms$ is cut into 10 equal parts and are connected in parallel to each other. The equivalent resistance of the combination is

asked Feb 13, 2014 by thanvigandhi_1

1 answer

The product of resistivity and conductivity of a conductor with uniform cross-section depends on

asked Feb 13, 2014 by thanvigandhi_1

1 answer

As the temperature of a metallic conductor is increased, the product of resistivity and conductivity

asked Feb 13, 2014 by thanvigandhi_1

2 answers

A current passes through a resistor. Let K1 and K2 be the average kinetic energy of the conduction electrons and metal ions respectively. Then:

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Two resistors R and 2R are connected in series in a circuit. The thermal energy developed in R and 2R are in the ratio

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Two resistors R and 2R are connected in parallel in a circuit. The thermal energy developed in R and 2R are in the ratio

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Consider the following two statements (A) Kirchhoff’s junction law follows from conservation of charge (B) Kirchhoff’s loop law follows from the conservative nature of electric field Then which of the following is true:

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Two resistors A and B have their resistances $R_A\: and\: R_B$ with $R_A\: >\: R_B$ . The resistivities of their material are related by

asked Feb 13, 2014 by thanvigandhi_1

1 answer

A metallic resistor is connected across a battery. If the number of collisions of free electrons with the lattice is somehow decreased in the resistor, the current will

asked Feb 13, 2014 by thanvigandhi_1

2 answers

In the circuit shown, potential difference between the points A and B is $16V$ . The current passing through the $2\Omega$ resistor will be

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Current in the $3\: ohm$ resistor is

asked Feb 13, 2014 by thanvigandhi_1

1 answer

The equivalent resistance between the points A and B is:

asked Feb 13, 2014 by thanvigandhi_1

1 answer

If $i= 3 \sin tw$ and $i_2= 4 \cos wt$ find $i_3$

asked Feb 13, 2014 by meena.p

1 answer

The equivalent resistance between the points A and B is

asked Feb 10, 2014 by thanvigandhi_1

1 answer

For what value of $R$ will the current passing through the $4\: ohm$ resistor is zero

asked Feb 10, 2014 by thanvigandhi_1

1 answer

Calculate the charge on the $5\mu F$ capacitor long time after assembling the circuit

asked Feb 10, 2014 by thanvigandhi_1

1 answer

The resistor which will dissipate maximum power is

asked Feb 10, 2014 by thanvigandhi_1

1 answer

In the circuit shown, if a wire is connected between points A and B, how much current will flow through it?

asked Feb 10, 2014 by thanvigandhi_1

1 answer

Find the equivalent resistance between A and B

asked Feb 10, 2014 by thanvigandhi_1

1 answer

Current passing through the $1\: ohm$ resistor is zero. The value of $E$ is

asked Feb 10, 2014 by thanvigandhi_1

1 answer

An ammeter and a voltmeter are joined in series to a battery. Their readings are $A$ and $V$ respectively. If a resistance is now joined in parallel with the voltmeter

asked Feb 10, 2014 by thanvigandhi_1

1 answer

$50V$ battery is supplying a current of $10A$ when connected to a resistor. If the efficiency of the battery at this current is 25%, then the internal resistance is:

asked Feb 10, 2014 by thanvigandhi_1

1 answer

Which of these is correct for each pair of statements? Statement 1: $40W$ tube light appears brighter than a $40W$ bulb. Statement2: Light sources having same power rating appear to glow equally brightly

asked Feb 10, 2014 by thanvigandhi_1

1 answer

Which of these is correct for each pair of statements? Statement 1: Resistance of $50W$ bulb is greater than that of a $100W$ bulb. Statement 2: Resistance of a bulb is inversely proportional to rated power.

asked Feb 10, 2014 by thanvigandhi_1

1 answer

Which of these is correct for each pair of statements? Statement 1: The conductivity of molten electrolytes is smaller than common metallic conductors. Statement 2: Positive and negative ions flow in opposite directions.

asked Feb 10, 2014 by thanvigandhi_1

1 answer

Which of these is correct for each pair of statements? Statement 1: When a battery is short-circuited, the terminal voltage is zero Statement 2: In the situation of a short-circuit, the current is zero

asked Feb 10, 2014 by thanvigandhi_1

1 answer

Which of these is correct for each pair of statements? Statement 1: When an electric current at the junction of two wires of the same material is directed from the thick wire to the thin wire, the drift speed of the electrons increase as they pass through the cross-section Statement 2: The drift speed of electrons is directly proportional to the electric field in the wire.

asked Feb 10, 2014 by thanvigandhi_1

1 answer

A wire of resistance $10\Omega$ is bent to form a circle. $P$ and $Q$ are two points on it such that the arc $PQ$ subtends a right angle at the center. A $3V$ battery having internal resistance of $1\Omega$ is connected across $P$ and Q, the currents in the two parts of the circle are

asked Feb 10, 2014 by thanvigandhi_1

1 answer

Three resistances $R, 2R$ and $3R$ are connected in parallel to a battery. Then

asked Feb 10, 2014 by thanvigandhi_1

1 answer

In a Hydrogen atom, an electron moves in an orbit of radius $5 \times 10^{-11}m$ with a speed of $2.2 \times 10^6 m/s.$ Calculate the equivalent current.

asked Feb 10, 2014 by thanvigandhi_1

1 answer

To get maximum current through a resistance of $2.5\Omega$ , one can use $‘m’$ rows of cells, each containing $‘n’$ cells connected in series. The internal resistance of each cell is $0.5\Omega$ . What are the values of $n$ and $m$ if the total numbers of cells are $45$ ?

asked Feb 10, 2014 by thanvigandhi_1

1 answer

A battery of internal resistance $2 \Omega$ is connected to a variable resistor whose value can be varied from $4\Omega\: to\: 10\Omega$ . If the variable resistance is gradually increased from an initial value of $4\Omega$ , the power consumed by it:

asked Feb 10, 2014 by thanvigandhi_1

1 answer

How many electrons flow through the filament of a $120V, 60W$ bulb in one second?

asked Feb 10, 2014 by thanvigandhi_1

1 answer

A current of $1A$ is passing through $CuSO_4$ solution. How many $Cu^{+2}ions$ ions will be deposited at the cathode in 5 seconds?

asked Feb 10, 2014 by thanvigandhi_1

1 answer

A uniform wire has resistance $R$ . It is cut into n equal parts and all of them are connected in parallel to each other. The resistance of the combination is:

asked Feb 10, 2014 by thanvigandhi_1

1 answer

A battery is supplying power to a tape-recorder by cable of resistance $0.02\Omega$ . If the battery is generating $50W$ at $5V$ , the power received by the tape-recorder is:

asked Feb 10, 2014 by thanvigandhi_1

1 answer

Calculate the mean free path in $Cu$ at room temperature $300K$ , if the number density of free electrons is $8.5 \times 10^{28}/m^3$ and resistivity $r = 1.7 \times 10^{-8} mho-m$ . Given $k = 1.38 \times 10^{-23} J/K \: and\: 1A = 10^{-10} m$

asked Feb 10, 2014 by thanvigandhi_1

1 answer

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: In a meter bridge experiment, the null point for the unknown resistance is measured. Now, the resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance. Statement- II: Resistance of a metal increases with temperature.

asked Feb 10, 2014 by thanvigandhi_1

1 answer

A constant voltage is applied to the two ends of a uniform metallic wire. Some heat is produced in it. The heat developed is doubled if

asked Feb 8, 2014 by thanvigandhi_1

1 answer

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: Electrons in a conductor have no motion in the absence of a potential difference across it. Statement- II: The electric field inside the static conductor is always zero.

asked Feb 8, 2014 by thanvigandhi_1

1 answer

Find the resistance of the wire frame shaped as a cube when measured between the points 1 and 3. The resistance of each edge is R

asked Feb 8, 2014 by thanvigandhi_1

1 answer

Find the resistance of the wire frame shaped as a cube when measured between the points 1 and 2. The resistance of each edge is R

asked Feb 8, 2014 by thanvigandhi_1

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

Page:

Feedback Terms Facebook Twitter About Us

Your payment for is successful.

...