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The Electric Lamps in a Building Should Be Connected in Parallel So that the Switching on Or off in a Room Has No Effect on Other Lamps in the Same Building. - Science

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प्रश्न

How should the electric lamps in a building be connected so that the switching on or off in a room has no effect on other lamps in the same building?

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उत्तर

The electric lamps in a building should be connected in parallel so that the switching on or off in a room has no effect on other lamps in the same building.

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अध्याय 2: Magnetic Effects of Electric Current - Exercise 5 [पृष्ठ ११४]

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लखमीर सिंग Physics (Science) [English] Class 10
अध्याय 2 Magnetic Effects of Electric Current
Exercise 5 | Q 16 | पृष्ठ ११४

वीडियो ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्न

Which effect of current can be utilised in detecting a current carrying wire concealed in a wall? 


Fill in the following blank with suitable words: 

The magnetic effect of a coil can be increased by increasing the number of ........... increasing the ........... or inserting an ........... core.


Describe some experiment to show that the magnetic field is associated with an electric current. 


If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be:

(a) west pole
(b) south pole
(c) north pole
(d) east pole


The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was ______.


If fuse of 250 mA, 500 mA, 1 A, 5 A and 10 A were available, which one would be the most suitable for protecting an amplifier rated at 240 V, 180 W?  


Observe the following diagram and choose the correct alternative:


Draw magnetic field lines produced around a straight current carrying conductor passing through a cardboard. How will the strength of the magnetic field change when the point where magnetic field is to be determined is moved away from the conductor?


Read the given passage and answer the following questions:

The home electrical connection consists of ‘live’, ‘neutral’ and ‘earth’ wires. The ‘live’ and the ‘neutral’ wires have potential difference of 220 V. The ‘earth’ is connected to ground. Due to a fault in the equipment or if the plastic coating on the ‘live’ and the ‘neutral’ wires gives a way the two wires come in contact with each other and a large current flows through it producing heat. If any inflammable material (such as wood, cloth, plastic, etc.) exists around that place it can catch fire. Therefore a fuse wire is used as a precautionary measure.

  1. Name the two wires having potential difference of 220 V.
  2. What is a short circuit?
  3. Write the function of a fuse.

Explain the magnetic field created around a straight current carrying conductor with the help of a diagram.


What is that instrument which can detect the presence of electric current in a circuit?


A uniform magnetic field exists in the plane of paper pointing from left to right as shown in Figure. In the field an electron and a proton move as shown. The electron and the proton experience


Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?


How does the magnetic effect of electric current help in the working of an electric bell? Explain with the help of a diagram.


Sailors use ______ to find direction in order to navigate on the sea.


An electric bell contains an ______, consisting of coils of insulated wire wound around
iron rods.


The figure given below shows the magnetic field around the conductor. Study it and answer the questions:

  1. What changes are caused by increasing current?
  2. What do you see when the magnetic needle is kept a little away from the wire?
  3. In the second part of the figure, the iron filings arrange themselves in a circular manner around the wire. Why does this happen?

As shown in the diagram an aluminium rod 'AB' is suspended horizontally between the two poles of a strong horse shoe magnet in such a way that the axis of rod is horizontal and the direction of the magnetic field is vertically upward. The rod is connected in series with a battery and a key.

State giving reason:

  1. What is observed when a current is passed through the aluminium rod from end B to end A?
  2. What change is observed in a situation in which the axis of the rod 'AB' is moved and aligned parallel to the magnetic field and current is passed in the rod in the same direction?

Using an electromagnet, you can make a working model of a railway signal as shown in figure.


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