Potential Difference

Q. The potential at a certain distance from a charge is 600V and the Electric field is 200N/C A) what is the distance to the point charge? B) what is the magnitude of charge?

Q. The amount of work done in moving a unit electric charge from a point to another in an electric field is called the _______ between the two points.

1. electric potential difference
2. electric energy
3. electric force
4. electric current

Q. When batteries are connected in series, in a way that the positive terminal of one battery is connected to the negative terminal of another battery, the potential difference of the circuit is ___ as compared to the circuit in which the same set of batteries are connected in parallel.

1. the same
2. higher
3. unknown
4. lower

Q.

A TV set shoots out a beam of electrons. The beam current is 10 A. How many electrons strike the TV screen in a minute?

Q. The potentials of two points A and B are respectively +V and -V volt. If the distance between them be r metre, then calculate (i) average electric field between A and B, (ii) change in potential energy in moving q coulomb of charge from point A to B.

Q.

The electric potential difference between two points in an electric circuit carrying some current is the work done to move a unit charge from one point to the other.

1. True

2. False

Q.

Electric potential difference between two points is the work done to move a unit charge from one point to the other.

1. True
2. False

Q. Gravitational potential energy depends upon the mass and height of the body.

1. True
2. False

Q.

If 300 joule of work is required to be done to transfer 30 coulombs of charge, then the potential difference between two ends of battery is________.

1. 900 V

2. 100 V

3. 0 V

4. 10 V

Q.

Potential energy possessed by an object of mass m and raised to a height 2h above the earth's surface is:

1. zero

2. mgh/2

3. mgh

4. 2mgh

Q. A student has to connect 4 cells of 1.5 V each, to form a battery of voltage 6 V. Choose the correct way of connecting the cells.

1. 
2. 
3. 
4. 

Q. Which of the following electric cell can be used in a circuit where $20J$ of energy is required to move a charge of $5C$?

1. $A$
2. $B$
3. $C$
4. $D$

Q. Two objects A and B of mass 6 kg and 1.5 kg respectively are kept at two different heights h and 2h. What will be the relation in the potential energy of the blocks?

1. $P{E}_A$ = $2P{E}_B$
2. $P{E}_A$ = $4P{E}_B$
3. $4P{E}_A$ = $P{E}_B$
4. $2P{E}_A$ = $P{E}_B$

Q. Which of the following electric cells can be used in a circuit where $20joule$ of energy is required to move a total charge of $5coulomb$?

1. Cell $C$
2. Cell $D$
3. Cell $A$
4. Cell $B$

Q.

What is the difference between electric potential and electric potential difference?

Q.

What is the difference between EMF and MMF?

Q.

Potential energy possessed by an object of mass m and raised to a height 2h above the earth's surface is:

1. zero

2. mgh/2

3. mgh

4. 2mgh

Q.

What is the difference between an emf and a potential difference? Under what circumstances are the potential difference between the terminal of battery and the emf of the battery are equal to each other?

Q.

When an ideal conductor is connected to the terminals of a battery of 5V, the potential difference between the two terminals becomes

1. zero

2. 5 V

3. infinite

4. 2.5 V

Q. How much work is being done by $14V$ battery to transfer a charge of $1C$ in a conductor?

1. $7J$
2. $2J$
3. $14J$
4. $1J$

Q. We have an electric kettle rated at $60V,5A$ that runs for $5$ minutes. The same amount of energy is used to accelerate a mass of $10kg$. What is the velocity attained​ by the​​​​​​ mass?

1. $100\sqrt{5}m{s}^{-1}$

2. $50\sqrt{5}m{s}^{-1}$

3. $30\sqrt{5}m{s}^{-1}$

4. $60\sqrt{5}m{s}^{-1}$

Q.

When a device requires large amount of current we use a battery instead of a cell.

1. True

2. False

Q. The electric potential at a point in free space due to a charge Q coulomb is Q X 10^11 volts .the electric field at that point is

Q. In which of the following cases, an electric current flows through a conductor?

1. When zero potential difference is applied across it
2. When a battery is connected to it in a closed circuit
3. When a battery is connected to it in an open circuit
4. When a potential difference is applied accross it in a closed circuit

Q. Alex of mass 40 kg is standing at a cliff of height 15 m while his friend Sam of mass 50 kg is standing at another cliff of height 7 m. Who among them has greater potential energy?
Take g = 10 ms${}^{-2}$.

Q.

What is the work done in moving a charge of 0.4 C across two points having a potential difference of 8 V?

1. 3.2 J
2. 0.2 J
3. 1.2 J
4. 0.4 J

Q.

Directions: In the following questions, a statement of assertion is followed by a statement of reason.

Mark the correct choice as:

Assertion: Charges flow from higher potential to lower potential.
Reason: Current flows are mainly due to the flow of electrons.

1. If both assertion and reason are true and reason is the correct explanation of assertion.

2. If both assertion and reason are true but reason is not the correct explanation of assertion.

3. If assertion is true but reason is false.

4. If assertion is false but reason is true.

Q.

Calculate the effective potential difference for the cells in series given below.

1. $20V$
2. $24V$
3. $26V$
4. $25V$

Q. Gravitational potential energy depends upon the mass and height of the body.

1. True
2. False

Q. Two objects A and B of mass 6 kg and 1.5 kg respectively are kept at two different heights h and 2h. What will be the relation in the potential energy of the blocks?

1. $P{E}_A$ = $2P{E}_B$
2. $P{E}_A$ = $4P{E}_B$
3. $4P{E}_A$ = $P{E}_B$
4. $2P{E}_A$ = $P{E}_B$