Tag: magnetic field due to a straight current carrying conductor

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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.

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 a characteristic of a buzzer?

  1. It has different mechanism from electric bell.

  2. It has higher frequency of collision of gong and hammer

  3. It uses only AC power supply

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

In a buzzer, the simplest sort of doorbell, an electromagnet is used to operate a self-interrupting circuit. You can see how this system works in the diagram below. Click and hold the doorbell button to see how the buzzer works. ... This breaks the doorbell circuit, which shuts off the electromagnet.characteristic of a buzzer It has higher frequency of collision of gong and hammer

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 power supply can be used in electric bell

  1. $AC$

  2. $DC$

  3. Can't be predicted 

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electric bell works on the mechanism of electromagnets and for this any type of power either AC or DC can be used.

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. Circuit is closed in the electric bell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
When the switch of an electric bell is pushed, current start to flow through the electromagnet.
When switch is pushed , circuit is closed and current starts flowing through the electromagnet in bell & bell starts ringing.
OPTION : B.
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 on then electric current in it :

  1. Flows and stops in succession

  2. Flows continuously

  3. First flows in one direction and after sometime in other direction

  4. Flows in beginning and then stops forever
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The bell works on the principle of electromagnetism which says that when an electric current flows through the coil, the rods become magnetic and attract a piece of iron attached to a clapper. And the clapper hits the cap and comes back as the current stops, and hence the bell rings. So the current flows and stops in succession. And in this way the bell rings.

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

Why doorbell rings repeatedly when switch is pressed 

  1. Because of nature of current

  2. Because electrical switch is built in such a manner

  3. Because of make and break arrangement

  4. Because of slight humidity in the circuit
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Make and break arrangement causes striker to repeatedly hit the metal gong as long as switch is pressed. When Circuit is complete, electromagnet attracts the striker which hits metal gong. As soon as the striker moves, circuit breaks and electromagnet is inactive. Because of flexibility of striker, it moves back to its original position. As soon as it reaches original position, circuit is complete. This process repeats continuously. 

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 will happen if the strip in a doorbell loses its flexibility?

  1. Striker may break if current is large.

  2. After hitting the metal gong, it never returns to original position and only a single sound is produced.

  3. System of doorbell breaks

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Because of lack of flexibility, striker will resist change of motion more and may break if current is large.

Without flexibility, no rebounding force is present and striker will not return to its original position.

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 is the use of flexibility strip in a doorbell?

  1. It brings back striker to its original position

  2. It supports the motion of the striker

  3. It completes the electric circuit flexibly

  4. Its a safety precaution
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Without the flexibility strip, the striker will not come back to original position when the electrical circuit breaks.

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

Electric doorbell

  1. Always consume power

  2. Consume power only when switch is pressed

  3. Do not consume power practically and needs only starting power

  4. cant say
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When switch is pressed, circuit completes and ringing begins. Hence, electrical energy is converted to sound energy. As switch is released, no current flows and no energy is consumed,

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

Exposed Electric doorbell can be damaged by 

  1. Mechanical damage

  2. High Electric currents

  3. Humidity

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mechanical Damage to metal gong or striker may hinder working of the bell.

High electric currents may cause heating and burning of electrical circuit.
Humidity may cause short circuit between two unconnected wires, causing high electric currents and damage.