Conductor definition physics series#
Conductor definition physics free#

Conductor definition physics free#

A conductor wire having 10 29 free electrons/m 3 carries a current of 20A.In the circuit shown, the currents i1 and i2 are…?.

Conductor definition physics series#

A potentiometer wire of length 10m and resistance 20Ω is connected in series with a…?.You are given several identical resistances each of value R=10Ω and each capable of carrying…?.Which of the following acts as a circuit protection device?.Two wires of the same metal have same length, but their cross-sections are in the ratio…?.Kirchhoff's first and second laws of electrical circuits are consequences of…?.In the network shown in the figure, each of the resistance is equal to…?.

In the circuit shown below, the current in the 1Ω resistor is…?.

If voltage across a bulb rated 220V- 100W drops by 2.5% of its rated value, the percentage of…?.

If power dissipated in the 9Ω resistor in the circuit shown is 36 watt, the potential difference…?.

For a cell terminal potential difference is 2.2 V when circuit is open and reduces to 1.8 V when…?.

Column - I gives certain physical terms associated with flow of current through a metallic conductor.

In the following network potential at ′O′….

In metre bridge experiment, with a standard resistance in the right gap and….

the equivalent emf and effective internal resistance of the combination is….

Effective resistance between A and B in the following circuit…..

The frequency of Direct Current will always remain zero.

The flow of the magnitude is always constant.

The direct current always flows in the same direction.

Though its frequency can change, it always remains above zero.

The flow of the magnitude of the current varies with time.

The alternating current flows in the direction opposite to the established flow.

The flow of the current is from an electrically abundant source to an electrically deficit one.Ĭurrent can be mainly divided into two types: Alternating Current.

Current always flows in a specific direction.

Current is denoted by the symbol I and measured by its standard unit Ampere. The flow of electrically charged particles is referred to as current. Read More: Current Density Important Questions Thus, current density (J) = 2 x 10 -3/10 x 10 -3 J Calculate this current density using the current density formula. Ques: A 10mm 2 of copper wire conducts a current flow of 2mA. The current density formula is given by, J = I / A Solution: It is given that, I = 40 A, Area = 10 m 2 Ques: Calculate the current density when 40 amperes of current is flowing through the battery in a given area of 10 m 2. Suppose that a medium (conductive material) has an electrical conductivity given by σ, then the density of electric current can be related to the electric field by the equation: Find the value of the resistance of the resistor.

When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit.

Calculate the resistance when it is glowing. It draws 0.4 ampere current from a source of4V and then starts glowing.

A small bulb has a resistance of 2 ohm when it is cold.

What is the difference between short-circuit and overloading?.

How is the drift velocity affected when V is doubled and l is halved?

A potential difference V is applied across a conductor of length ‘l’.

A potentiometer consists of a wire of length 4m and resistance 10Ω.

Find the current through a resistance 2 ohm if the voltage across the resistance is 6V.

Explain What Happens When Amber is Rubbed with Wool or Silk.

A current of 1 ampere flows in a series circuit containing an electric lamp and a conductor of 5 Ω…?.

The terminal voltage of the battery when the circuit is closed is? A battery of emf 10 v and internal resistance 3 omega is connected to a resistor.It is the amount of current flowing across the given region.Current density is a vector quantity that has both a direction and a scalar magnitude.The stronger the current, the more intense will the magnetic field be. The electric current generates a magnetic field.The more the current is in a conductor, the higher the current density.It is denoted in Amperes per square meter.Current Density is the flow of electric current per unit cross-section area.Varying AC or DC leads to an electromagnetic field and this is the principle based on which signal propagation takes place. With a stronger current, the intensity of the magnetic field increases. Electric current always creates a magnetic field. However, the current density alters in different parts of an electrical conductor resulting in alternating currents at higher frequencies. Current density in a conductor can be defined as the charge flow through any cross-section of the conductor.