Tag: electric potential and potential difference

Questions Related to electric potential and potential difference

The speed at which the current travels in a conductor, is nearly

physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

  1. $3 \times 10^0 ms^{-1}$

  2. $3 \times 10^5 ms^{-1}$

  3. $4 \times 10^6 ms^{-1}$

  4. $3 \times 10^8 ms^{-1}$

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Correct Option: D
Explanation:

Current travels in a conductor at a speed approximately equal to speed of light i.e. $3\times 10^8$ $ms^{-1}$.

Which of the following statements is true?

physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

  1. Electricity can be created

  2. Electricity flows in a circuit with gaps

  3. Electricity is the flow of negative charge

  4. All of the above

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Correct Option: C
Explanation:

(A) Option:- Electricity can be created. This statement is false because electricity is basically a form of energy that cannot be created nor be destroyed 


(B) Option:- Electricity flows in a circuit with gaps. This statement is false because electricity does not flow in open circuit.


(C) Option:- Electricity is the flow of negative charges.T his statement is true because due to the flow of electrons electricity is generated electrons are negatively charged.

In a cell, electrons move from:

physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

  1. positive electrode to negative electrode.

  2. negative electrode to positive electrode.

  3. both A and B.

  4. electrons do not move and only negative charge moves from one place to another place.

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Correct Option: B
Explanation:

In cells, electrons move from negative electrode to positive electrode and an electron has negative charge. So, we can say that negative charge flows from negative electrode to positive electrode. But, by convention flow of charges are measured only through positive charges.When an electron moves from point A to point B,an equal amount of positive charge moves from point B to point A.

So, the direction of charge is from positive electrode to negative electrode. As unlike charges attract each other and like charges repel each other, thus electrons move from negative electrode to positive electrode inside a cell.

Electric current is the flow of

physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

  1. electrons

  2. protons

  3. neutrons

  4. none of these

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Correct Option: A
Explanation:

Electric current is defined as the flow of electrons.

In electrolysis:

physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

  1. positive ions move toward the positive electrode and negative ions toward the negative electrode.

  2. positive ions move toward the negative electrode and negative ions toward the positive electrode.

  3. both ions move toward both the electrodes in equal amounts until they are balanced.

  4. none of the above

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Correct Option: B
Explanation:

As unlike charges attract each other and like charges repel each other. Thus in electrolysis, positive ions move towards the negative electrode whereas negative ions move toward the positive electrode.Hence option B is correct.

The direction of current is taken as

physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

  1. The opposite to the direction of flow of current.

  2. Opposite to the direction of flow of protons.

  3. Opposite to the direction of flow of electrons.

  4. All

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Correct Option: C
Explanation:
Conventionally, the direction of current is taken as the direction of flow of positive charge (protons) and opposite to the direction of flow of negative charge (electrons).
Hence option C is correct.

In a DC circuit when a switch is closed to operate the circuit, the electrons that cause the current:

physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

  1. travel from the negative plate of the battery to the positive plate

  2. travel from the positive plate of the battery to the negative plate

  3. travel from one resistance to the next resistance

  4. travel from the negative plate of the battery to the positive plate inside the battery

  5. travel from one atom in the circuit to the next atom

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Correct Option: A
Explanation:

In a DC circuit , when switch is closed , the free electrons in wire are drifted from negative plate of the battery to positive plate.

The direction of current in a conductor is in the direction of flow of

physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

  1. Electrons

  2. Atom

  3. Positive charge

  4. None

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Correct Option: C
Explanation:

Conventionally, the current flows in the direction of flow of positive charge or opposite to the flow of negative charge (electrons).

The direction of current is taken as 

physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

  1. The opposite to the direction of flow of neutrons.

  2. The opposite to the direction of flow of protons.

  3. Opposite to the direction of flow of electrons

  4. All

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Correct Option: C
Explanation:

Direction of current is taken as direction of flow of positive charge.
Opposite to the direction of flow of electrons.

Direction of current is taken opposite to the direction of flow of .....

physics electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

  1. holes

  2. electrons

  3. neurons

  4. protons

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Correct Option: B
Explanation:

Electrons are negatively charged particles. So, by convention, the direction of current is considered as the opposite to the direction of motion of electrons.