Balbharati Class 8 General Science Solutions Current Electricity and Magnetism
Welcome to NCTB Solutions. Here with this post we are going to help 8th class students for the Solutions of Balbharati Class 8 General Science Book Chapter 4, Current Electricity and Magnetism. Here students can easily find step by step solutions of all the questions in Current Electricity and Magnetism. Also our Expert Science Teacher’s solved all the problems with easily understandable language with proper guidance so that all the students can understand easily. Here in this post students will get chapter 4 solutions. Here all the Question Answer are based on Balbharati latest syllabus. Here all the question and answer are based on Maharashtra State Board latest syllabus.
Current Electricity and Magnetism Exercise question Solutions :
Question no – (1)
(a) Water in the waterfall flows from a higher level to the lower level because of Gravitational attraction.
(b) In an electric circuit, electrons flow from a point of Higher potential to the point of lower potential.
(c) The difference between the electrostatic potential of the positive end the negative end of an electric cell is the Potential difference of the cell.
(d) Three electric cells of potential difference 1.5 V each have been connected as a battery, The potential difference of the battery will be 4.5 V
To get 4.5 V → multiply the potential difference of one cell to total no. of cells present to get the answer.
(e) An electric current flowing in a wire creates Magnetism around the wire.
Question no – (3)
Answer : 4
In order to find out the reason for the bulb not glowing I will check whether the positive terminal of one cell is connected to the negative terminal of other cell in the battery or not and if the electrical circuit is complete or not.
Question no – (4)
The total potential difference of the battery in both cases as follows :
(i) 6V = The potential difference is 6 V because the battery consists of 3 cells of 2 volts each.
(ii) 8V = The Potential difference is 8 V because the battery consists of 4 cells of 2 volts each.
Question no – (5)
- Construction of Dry Cell :
A dry cell consists of a protective layer which contains a zinc layer, an electrolyte which consists of zinc chloride and ammonium is filled between the zinc layers ,a graphite rod which acts as a positive terminal is at the center and a manganese dioxide paste around the rod.
- Working of Dry Cell :
Due to all the chemicals mentioned above a chemical reaction takes places and an electric charge is produced on the two terminals that is graphite rod and zinc layer and thus an electric current flows through the circuit.
- Usefulness of dry Cell :
Dry cells are very useful as they can be used in any direction with respect to ground and can be used in any mobile instruments such as T.V remote.
Question no – (6)
- Construction of electric bell :
Electric bell consists of a bell, an electromagnet which is worn around by a copper wire, a contact screw along with an iron strip and a striker which are placed near the the electromagnet.
- Working of electric bell :
The current flows when the screw is in contact with the strip, then the coil becomes a magnet and attracts the strip towards it which then moves the striker towards the bell and a sound is made. In this situation the coil loses its magnetism and the iron strip falls back to the screw and the connection is restored, the striker hits the bell again and again in the same process till the switch is pressed.
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