Current Electricity · Physics · KCET

A wire of resistance $$R$$ is connected across a cell of emf $$(\varepsilon)$$ and internal resistance $$(r)$$. The current through the circuit is $$I...

For a given electric current the drift velocity of conduction electrons in a copper wire is $$v_d$$ and their mobility is $$\mu$$. When the current is...

Ten identical cells each emf $$2 \mathrm{~V}$$ and internal resistance $$1 ~\Omega$$ are connected in series with two cells wrongly connected. A resis...

The equivalent resistance between the points A and B in the following circuit is ...

The resistance of a carbon resistor is $$4.7 ~\mathrm{k} \Omega \pm 5 \%$$. The colour of the third band is

The four bands of a colour coded resistor are of the colours grey, red, gold and gold. The value of the resistance of the resistor is

A moving coil galvanometer is converted into an ammeter of range 0 to $$5 \mathrm{~mA}$$. The galvanometer resistance is $$90 \Omega$$ and the shunt r...

A charged particle is moving in an electric field of $$3 \times 10^{-10} \mathrm{Vm}^{-1}$$ with mobility $$2.5 \times 10^6 \mathrm{~m}^2 / \mathrm{V}...

Wire bound resistors are made by winding the wires of an alloy of

10 identical cells each potential $$E$$ and internal resistance $$r$$ are connected in series to form a closed circuit. Determine the potential diffe...

In an atom electrons revolve around the nucleus along a path of radius $$0.72\mathop A\limits^o$$ making $$9.4 \times 10^{18}$$ revolutions per second...

When a metal conductor connected to left gap of a meter bridge is heated, the balancing point

A wire of a certain material is stretched slowly by $$10 \%$$. Its new resistance and specific resistance becomes respectively

A galvanometer of resistance $$50 \Omega$$ is connected to a battery $$3 \mathrm{~V}$$ along with a resistance $$2950 \Omega$$ in series. A full scale...

If voltage across a bulb rated $$220 \mathrm{~V}, 100 \mathrm{~W}$$ drops by $$2.5 \%$$ of its rated value, then the percentage of the rated value by ...

A wire of resistance $$3 \Omega$$ is stretched to twice its original length. The resistance of the new wire will be

In the given arrangement of experiment on meter bridge, if $$A D$$ corresponding to null deflection of the galvanometer is $$X$$, what would be its va...

A copper wire of length $$1 \mathrm{~m}$$ and uniform cross-sectional area $$5 \times 10^{-7} \mathrm{~m}^2$$ carries a current of $$1 \mathrm{~A}$$. ...

Consider an electrical conductor connected across a potential difference $$V$$. Let $$\Delta q$$ be a small charge moving through it in time $$\Delta ...

A metal rod of length $$10 \mathrm{~cm}$$ and a rectangular cross-section of $$1 \mathrm{~cm} \times \frac{1}{2} \mathrm{~cm}$$ is connected to a batt...

A car has a fresh storage battery of emf $$12 \mathrm{~V}$$ and internal resistance $$2 \times 10^{-2} \Omega$$. If the starter motor draws a current ...

A potentiometer has a uniform wire of length $$5 \mathrm{~m}$$. A battery of emf $$10 \mathrm{~V}$$ and negligible internal resistance is connected be...

The colour code for a carbon resistor of resistance $$0.2 \mathrm{k} \Omega \pm 10 \%$$ is

Each resistance in the given cubical network has resistance of $$1 \Omega$$ and equivalent resistance between $$A$$ and $$B$$ is ...

$$I-V$$ characteristic of a copper wire of length $$L$$ and area of cross-section $$A$$ is shown in figure. The slope of the curve becomes ...

The readings of ammeter and voltmeter in the following circuit are respectively ...

Though the electron drift velocity is small and electron charge is very small, a conductor can carry an appreciably large current because

Masses of three wires of copper are in the ratio $$1: 3: 5$$ and their lengths are in the ratio $$5: 3: 1$$. The ratio of their electrical resistance ...

In the given circuit, the current through 2$$\Omega$$ resistor is ...

Kirchhoff 's junction rule is a reflection of

The variation of terminal potential difference $$V$$ with current flowing through a cell is as shown. The emf and internal resistance of the cell are ...

In a potentiometer experiment, the balancing point with a cell is at a length $$240 \mathrm{~cm}$$. On shunting the cell with a resistance of $$2 \Ome...