Question 11 Mark
What type of charge is produced on an ebonite rod when it is rubbed with a cat's fur?
Answer
View full question & answer→When the ebonite rod is rubbed with the cat's fur, the ebonite rod acquires the negative charge.
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Question 21 Mark
What will happen when a glass rod is rubbed with some silk cloth?
Answer
View full question & answer→When a glass rod is rubbed with silk, the glass rod acquires a positive charge.
Question 31 Mark
Name the scientist who first assigned algebraic signs to charges.
Answer
View full question & answer→Benjamin Franklin was the scientist who first assigned the algebraic signs to charges.
Question 41 Mark
What does a negatively charged body signify?
Answer
View full question & answer→A negatively charged body signifies that it contains a number of electrons more than the number of protons.
Question 51 Mark
What does a positively charged body signify?
Answer
View full question & answer→A positively charged body signifies that its nucleus contains more protons than electrons.
Question 61 Mark
How many kinds of charges have you come across?
Answer
View full question & answer→There are two kinds of charges - positive and negative charges.
Question 71 Mark
What is meant by the earthing of an electroscope?
Answer
View full question & answer→ Earthing of an electroscope is meant to take the thick copper strip inside the earth so that charges induced from thunderstorms on the metal spikes can move to earth to safeguard buildings from thunderstorms.
Question 81 Mark
Name the scientist who first observed the electrical properties of amber.
Answer
View full question & answer→Thales of Miletus was the scientist who observed the electric properties of amber.
Question 91 Mark
The following Figure represents a negatively charged gold Ieaf electroscope. Label the parts, P, Q, and R and the estate whether each is an insulator or a conductor. Also, indicate the distribution of charges on the system in the diagram.
Answer
View full question & answer→P is a Cap, Q is plug and R is the bottle in the negatively charged gold leaf electroscope. P is a conductor and Q, R is an insulator.
Question 101 Mark
What is the purpose of an electroscope?
Answer
View full question & answer→The purpose of an electroscope is to detect the presence of charge on the body and nature of the charge (whether its positively charged or negatively charged) on the body.
Question 111 Mark
The charge on a body is -1.8e. Is this statement true?
Answer
View full question & answer→The charge is quantized and Q = ne where n should be the only integer. Since Q = -1.8 e where n is not an integer. So, this charge is not possible.
Question 121 Mark
Sometimes when you take off your nylon clothes, your hair stands on their end. Explain the observation.
Answer
View full question & answer→When the nylon cloth gets rubbed with hairs then it acquires the negative charge because few free electrons get transferred from hairs to nylon and they get attracted towards nylon cloth so the hair stands on their end.
Question 131 Mark
State the kind of charge on a negative ion.
Answer
View full question & answer→On negative ion, there exists a negative charge.
Question 141 Mark
State the kind of charge on a positive ion.
Answer
View full question & answer→On a positive ion, there exists a positive charge.
Question 151 Mark
What are free electrons?
Answer
View full question & answer→The electrons of the outermost orbit of an atom are the free electrons and they easily leave their respective atoms and become free to move inside the solid.
Question 161 Mark
What is the other name of frictional electricity?
Answer
View full question & answer→Frictional electricity is also known as static electricity.
Question 171 Mark
What is the net charge on an atom?
Answer
View full question & answer→The net charge on an atom is zero.
Question 181 Mark
What is the value of charge on an electron? Is a charge less than the value possible?
Answer
View full question & answer→The value of charge on an electron = $-1.6 x 10^{-19}C$. No, the charge less than the charge of an electron is not possible.
Question 191 Mark
What is the SI unit of charge?
Answer
View full question & answer→The S. I unit of charge is the coulomb.
Question 201 Mark
A glass rod rubbed with silk cloth acquires a charge of $+1.6 X 10^{-12}C.$ What is the charge on the silk cloth?
Answer
View full question & answer→The silk cloth will acquire the charge opposite to the charge of the glass rod. So the charge acquired by silk cloth will be $= -1.6 x 10 ^{-19}C.$
Question 211 Mark
Can ever photons have a charge? If not, why?
Answer
View full question & answer→Photons can never have a charge because charges never exist without rest mass.
Question 221 Mark
Does the motion of a body affect its charge?
Answer
View full question & answer→No, the motion of the object does not affect the charge on the body.
Question 231 Mark
How do the charges interact?
Answer
View full question & answer→Unlike charges attract each other and like charges repel each other.
Question 241 Mark
Consider three charged bodies A, B, and C. If A and B repel each other and A attracts C, what is the nature of force between B and C?
Answer
View full question & answer→There will be an attractive force between the B and C because both carry opposite charges.
Question 251 Mark
Is the mass of the body affected by charging?
Answer
View full question & answer→Yes, the mass of the body gets affected by charging.
Question 261 Mark
What do you mean by electrostatics?
Answer
View full question & answer→Electrostatics is defined as the study of charges at rest.
Question 271 Mark
Who first showed two kinds of charges and who gave them algebraic signs?
Answer
View full question & answer→Sir Williams Gilbert was the scientist who showed two charges and Benjamin Franklin was the scientist who gave name to charges.
Question 281 Mark
What is the cause of charging?
Answer
View full question & answer→The cause of charging is the frictional forces between the two bodies when they are rubbed against each other.
Question 291 Mark
What is the origin of frictional forces?
Answer
View full question & answer→The origin of frictional forces is electrical in nature.
Question 301 Mark
What is the value of charge on a body which carries 100 excess electrons?
Answer
View full question & answer→$Q = n e$
The charge on an electron $= -1.6 x 10^{-19}$
$= 100 x 1.6 x 10^{-19} = 1.6 x 10^{-17}$
The charge on an electron $= -1.6 x 10^{-19}$
$= 100 x 1.6 x 10^{-19} = 1.6 x 10^{-17}$
Question 311 Mark
Which is bigger: 1 C or magnitude of the charge on an electron?
Answer
View full question & answer→1 C is bigger than the charge on an electron.
Question 321 Mark
How many electrons are present in one coulomb?
Answer
View full question & answer→$Q = ne$
$N = Q/e = 1C / 1.6 x 10^{-19} = 6.25 x 10^{18}$
$N = Q/e = 1C / 1.6 x 10^{-19} = 6.25 x 10^{18}$
Question 331 Mark
Name a physical quantity, other than an electric charge, which is quantized.
Answer
View full question & answer→Energy other than electric charge is quantized.
Question 341 Mark
What is the quantization of charge?
Answer
View full question & answer→The quantization of charge is the property by virtue of which every charge exists only in discrete lumps or packets of some minimum charge.
Question 351 Mark
What do you mean by induced magnetism?
Answer
View full question & answer→The magnetism acquired by the magnetic material when it is kept near the magnet is called induced magnetism.
Question 361 Mark
Can we isolate the poles of a magnet?
Answer
View full question & answer→No, we cannot isolate the poles of the magnet.
Question 371 Mark
Define the term Effective length of a magnet
Answer
View full question & answer→Effective Length of the magnet: The distance between the poles of the magnet is the effective length of a magnet.
Question 381 Mark
Define the term Poles of a magnet
Answer
View full question & answer→Poles of the Magnet: The points of the magnet where the attraction appears to be maximum are called poles of the magnet.
Question 391 Mark
Define the term Magnetic axis
Answer
View full question & answer→Magnetic axis: The imaginary line joining the poles of the magnet is called the magnetic axis.
Question 401 Mark
How will you test whether a given rod is made of iron or copper?
Answer
View full question & answer→Bring the rod near the magnet, iron rod will get attracted towards the magnet while copper will not.
Question 411 Mark
What do you understand by poles of a magnet?
Answer
View full question & answer→The magnetic forces appear to be concentrated at the near ends of the magnet. These points are called the magnetic poles.
Question 421 Mark
What is the resultant magnetic field at a neutral point?
Answer
View full question & answer→ The resultant magnetic field at a neutral point is zero.
Question 431 Mark
What is the significance of a neutral point?
Answer
View full question & answer→Neutral points help in finding the magnitude and direction of the earth's magnetic field at that particular point.
Question 441 Mark
What do you mean by the term neutral point?
Answer
View full question & answer→Neutral points are the points where the magnetic field of magnet has the magnitude equal to the magnitude of the earth's magnetic field but in the opposite direction.
Question 451 Mark
How will you plot the magnetic field lines by using a small compass needle?
Answer
View full question & answer→The directions indicated by the needle of the compass will help to draw the magnetic lines of force.
Question 461 Mark
Magnetic field lines intersect each other, if yes, why?
Answer
View full question & answer→No, the Magnetic field of lines cannot intersect each other.
Question 471 Mark
What is the use of a magnetic compass?
Answer
View full question & answer→The magnetic compass is used to draw the magnetic field of lines around the magnet.
Question 481 Mark
What is a lodestone?
Answer
View full question & answer→The natural magnet which was used for the navigation by the mariners is called a lodestone.
Question 491 Mark
What do you mean by the term lines of the magnetic field?
Answer
View full question & answer→The lines of the magnetic field are the continuous curve such that the tangent drawn at any point gives the direction of the magnetic field at that point.
Question 501 Mark
What is the purpose of an electroscope?
Answer
View full question & answer→An electroscope is used to determine the nature of the charge and to detect the presence of charge on the body.