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A comb run through one's dry hair attrac...

A comb run through one's dry hair attracts small bits of paper. This is due

A

a) the atoms of the paper get polarised by the charged comb

B

b) the comb possesses magnetic properties

C

c) comb is a good conductor

D

d) paper is a good conductor

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A comb run through one's dry hair attracts small bits of paper. Why? What happens, if the hair is wet or if it is a rainy day?

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If hydrogen atoms (in the ground state ) are passed through an homogeneous magnetic field, the beam is split into two parts. This interaction with the magnetic field shows that the atoms must have magnetic moment. However, the moment cannot be due to the orbital angular momentum since l=0. Hence one must assume existence of intrinsic angular momentum, which as the experiment shows, has only two permitted orientations. Spin of the electron produce angular momentum equal to S=sqrt(s(s+1))(h)/(2pi) where S=+(1)/(2) . Total spin of an atom = +(n)/(2) " or "-(n)/(2) where n is the number of unpaired electrons. The substance which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment of an atom mu_(s)sqrt(s(s+1))(eh)/(2pimc)=sqrt((n)/(2)((n)/(2)+1))(eh)/(2pimc)" "s=(n)/(2) impliesmu_(s)=sqrt(n(n+1)) B.M. 1. B.M. (Bohr magneton)= (eh)/(4pimc) If magnetic moment is zero the substance is diamagnetic. If an ion of _(25)Mn has a magnetic moment of 3.873 B.M. Then oxidation state of Mn in ion is :

If hydrogen atoms (in the ground state ) are passed through an homogeneous magnetic field, the beam is split into two parts. This interaction with the magnetic field shows that the atoms must have magnetic moment. However, the moment cannot be due to the orbital angular momentum since l=0. Hence one must assume existence of intrinsic angular momentum, which as the experiment shows, has only two permitted orientations. Spin of the electron produce angular momentum equal to S=sqrt(s(s+1))(h)/(2pi) where S=+(1)/(2) . Total spin of an atom = +(n)/(2) " or "-(n)/(2) where n is the number of unpaired electrons. The substance which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment of an atom mu_(s)sqrt(s(s+1))(eh)/(2pimc)=sqrt((n)/(2)((n)/(2)+1))(eh)/(2pimc)" "s=(n)/(2) impliesmu_(s)=sqrt(n(n+1)) B.M. 1. B.M. (Bohr magneton)= (eh)/(4pimc) If magnetic moment is zero the substance is diamagnetic. Which of the following ion has lowest magnetic moment?

Read the following passage and answer the questions. Ultrafiltration is the process of separating the colloidal particles from the solvent and soluble solutes present in the colloidal solution by specially prepared filters, which are permeable to all substances except the colloidal particles. Colloidal particles can pass through ordinary filter paper because the pores are too large. However, the pores of filter paper can be reduced in size by impregnating with collodion solution to stop the flow of colloidal particles. The usual collodion is a 4% solution of nitrocellulose in a mixture of alcohol and ether. An ultra-filter paper may be prepared by soaking the filter paper in a collodion solution, hardening by formaldehyde and then finally drying it. Thus, by using ultra-filter paper, the colloidal particles are separated from rest of the materials. Ultrafiltration is a slow process. To speed up the process, pressure or suction is applied. The colloidal particles left on the ultra-filter paper are then stirred with fresh dispersion medium (solvent) to get a pure colloidal solution. What is ultrafiltration ?

MODERN PUBLICATION-TEXUAL QUESTIONS -EXERCISE
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  2. Assertion : The charge on a conductor can be transferred to a hollow s...

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  3. A comb run through one's dry hair attracts small bits of paper. This i...

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  4. What are the dimensions of K = 1//4 piepsilon0?

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  5. If both the charges and distance between them is doubled, then new ele...

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  6. When air is replaced by a dielectric medium of dielectric constant K, ...

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  7. A hollow cylindrical conductor having positive charge is placed near a...

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  8. The number of electrons to be put on a spherical conductor of radius 0...

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  9. An electric field required to keep a water drop of mass m just to rem...

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  10. There is an electric field E in x-direction. If the work done on movin...

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  11. What is the angle between the electric dipole moment and the electric ...

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  12. An arbitraty surface enclose a dipole. What is the electric flux throu...

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  13. A hollow metallic sphere of radius 10 cm is charged, such that potenti...

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  14. Two equal and opposite charges (+q and -q) are situated at x distance ...

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  15. A charge q is distributed over two concentric hollow spheres of raddii...

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  16. What is not true for equipotential surface for a uniform electric fiel...

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  17. Which of the following is not the property of equipotential surfaces?

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  18. The charge given to any conductor resides on its outer surface, becaus...

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  19. The electrostatic capacitance depends on

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  20. n identical mercury droplets charged to the same potential V coalesce ...

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