Tag: current electricity and magnetism

Quizzes (3) Questions (24)

Questions Related to current electricity and magnetism

Multiple choice physics current electricity and magnetism electric cells and batteries

When two batteries are connected in series the voltage in the circuit will _____________ .

  1. increase

  2. decrease

  3. remains same

  4. first decrease than increase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a series connection the positive terminal of the first battery is connected to the negative terminal of the second battery.

And the Equivalent voltage of the battery is the sum of the voltage of individual cell.So, when two batteries are connected in series the voltage in the circuit will increases.
Therefore, A is correct option.

Multiple choice physics current electricity and magnetism electric cells and batteries

Choose the wrong option

  1. A cell is a single unit which converts chemical energy to electrical energy to deliver a voltage while a battery is composed of a number of cells in series to get increased voltage

  2. A Battery is a single unit which converts chemical energy to electrical energy to deliver a voltage while a cell is composed of a number of batteries in series to get increased voltage

  3. In the combination of cells, cells are connected in such a way that negative terminal of a cell is connected to positive terminal of the next cell

  4. In the combination of cells, cells are connected in such a way that negative terminal of a cell is connected to negative terminal of the next cell
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Explanation

Both cell and battery store the chemical energy and then transforms the stored chemical energy to electrical energy. But cell is a single unit with positive and negative terminal whereas battery is a combination of cells connected end to end i.e. positive  to negative terminal.

Multiple choice physics current electricity and magnetism electric cells and batteries

While making a battery ___________  of a cell is connected to ________ of other cell.

  1. negative terminal , negative terminal

  2. positive terminal , negative terminal

  3. positive terminal , positive terminal

  4. neutral terminal ,negative terminal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

While making a battery, negative end of battery is connected to positive terminal of other cell and so on.


Answer-(B)

Multiple choice physics electric current and its effects electric bell the magnetic effect of a current current electricity and magnetism

An electric bell has a resistance of $5 \Omega$ and requires a current of $0.25\ A$ to work it. Assuming that the resistance of the bell wire is $1 \Omega$ per $15m$ and that the bell push is $90m$ distance from the bell. How many cells each of emf $1.4V$ and internal resistance $2 \Omega$, will be required to work the circuit.

  1. $3$
  2. $4$
  3. $5$
  4. $Can't\ be\ determined$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total resistance = R_bell + R_wire = 5 + (90/15)*1 = 11 ohms. Current = 0.25A. Total EMF required = I * R_total = 0.25 * (11 + n*r_internal). Solving for n with 1.4V cells.

Multiple choice physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

What material is used for making the armature of an electric bell ? Give a reason for using this material.

  1. Soft Iron

  2. Carbon

  3. Glass

  4. Silicon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Soft iron is used for making the armature of an electric bell because soft iron is magnetised easily on passing the current and completely demagnetised easily on withdrawing the current through the solenoid.

Multiple choice physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

Working of electric bells is an example of

  1. Mechanical effect of electric current

  2. Heating effect of electric current

  3. Magnetic effect of electric current

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An electric bell contains an electromagnet, consisting of coils of insulated wire wound round iron rods. When an electric current flows through the coils, the rods become magnetic and attract a piece of iron attached to a clapper. The clapper hits the bell and makes it ring.

Multiple choice physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

When the switch of an electric bell is pushed.

  1. Flow of the current stops through the electromagnet in the bell

  2. Current starts to flow through the electromagnet

  3. Voltage decreases in the current flowing through the electromagnet

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the switch of electric bell is pushed,circuit completes and current flows leading an electromagnet to attract armature and ring the bell.

Multiple choice physics current electricity and magnetism electric bell the magnetic effect of a current electromagnetic forces oersted experiment oersted's experiment magnetic field due to a straight current carrying conductor

Which of the following is not a component of electric bell?

  1. Gong

  2. Ferromagnetic strip

  3. Low magnetic field permanent magnet to attract ferromagnetic strip

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Electric bell works on the mechanism of electromagnets i.e, temporary magnets, and no permanent magnet is used.

Temporary magnet allows the ferromagnetic strip to return back to its initial state as switch is released.