Science, asked by kunal4269, 11 months ago

answer these questions A charge of 5 coulombs is moved in an electric field from a point of higher potential of 100
volt to a point of lower potential of X volts by doing 50 joules of work. Calculate the value
L. Which one
of H+ ions
of the potential X.
[Ans.: 90 volts]
2. Why does
A music system connected to a 220 volts power supply offers a resistance of 100 ohms to
concentrati
the flow of current through it. Calculate the value of current in milliamperes.
solution?
3. What is c
(Ans.: 2200 mA] CaOCI,?
An electric circuit consists of an unknown resistance and a 9 volts battery. A current of 4.
5 1 Name the
mA is flowing through the circuit. Find the value of the unknown resistance.
chlorine y
[Ans.: 2000 ohms]
5. Name the
4. A copper wire of length 100 metres has a resistance of 5 ohms. Calculate the diameter of softening
the wire, given that the resistivity of copper is 1.7 x 10-8 ohm-m. [Ans.: 0.65 x 102m] It Answer
Calculate the resistance of a metal wire of length 5 metres and having an area of cross-section
5. Match th
1.25 x 10-6 m”, if the resistivity of the metal is 2.6 x 10-8 2 m.
[Ans.: 0.102] (A) wit
6. Which will show higher resistance, a gold wire or a silver wire, given their dimensions as Column
the same? Calculate the value of resistance of a gold wire with a length of 1 m and having
Со
a diameter of 1 mm.
(Ans.: Silver, 2.89 x 10'Q]
(a) PL
(b) 6
Express 0.005 ampere current in milliampere and in microampere. (Ans.: 5 mA, 5,000 uA]
(c) B
A current of 0.7 A is drawn by a filament of an electric bulb for 5 minutes. Find the amount
(d) S
of electric charge that flows through the filament.
[Ans.: 210 C]

Answers

Answered by yadavmohit94567

Answer:

Explanation:

Electric Potential

If two charged bodies are in contact, the charge starts flowing from one conductor to other. The electric condition, that determines the flow of charge from one conductor to other in contact, is the electric potential. Electric potential is comparable to level in case of water, the temperature in case of heat and pressure in the case of fluids. Earth is a conductor that can hold an infinite charge and can give infinite charge without changing its potential.

Its potential is taken as zero potential. Thus the positively charged conductor has more positive potential than the earth. A negatively charged conductor has negative potential less than that of the earth.The electric potential difference between two points in an electric circuit is the work done in moving a unit positive charge from one point to the other.

When W joule of work is done in bringing the test charge Q coulomb from infinity to the point P then the electric potential V at the point P then, V= W/Q

The work needed to move a charge Q from infinity to a point P where electric potential is V will be W=QV

The S.I unit of work is joule and that of the charge is coulomb.

What is Electric Charge? Read here.

Potential difference

Electrical Potential

When the current flows between two points A and B of an electric circuit, we only consider the charge between the points A and B, this means it is not necessary to know the exact potential at each point A and B. It is sufficient to know the potential difference between the two points A and B. Therefore the potential difference between the two points is equal to the work done in moving a unit positive charge from one point to the other.

The potential difference is expressed in volt (V). The potential difference between two points is said to be 1 volt if the work is done in moving 1-coulomb charge from one point to other is 1 joule.

1 volt= 1 joule/ 1 coulomb

Unit for measuring the potential difference is volt and instrument used for measuring potential difference is a voltmeter. While connecting voltmeter in the circuit, positive terminal of the voltmeter should be in connection with the positive terminal of the cell and negative with the negative of the cell.

What happens when the battery is in connection with the circuit?

When a conducting wire is in connection with the terminals of the battery, a potential difference is created between the ends of the conductor. This potential difference sets up an electric field throughout the conductor.The electrons near the positive terminal of the battery are attracted by it and start on the move towards positive terminal.

Solved Example For You

Q.What potential difference is required to do 100 J of work to carry a charge of 10 C between two points?

Solution: Given,

work done (W) = 100J

Charge (Q) = 10C

Potential difference (V) =?

V = W/Q

V = 100 J ÷ 10 C = 10 V

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