Q15 of 216 Page 473

The given magnet is divided into three parts A, B and C.


Name the parts where the strength of the magnetic field is:


i. maximum


ii. minimum


How will density of magnetic field lines differs at these parts?

Parts where the strength of the magnetic field is


i) maximum: part A and part C


ii) minimum: part B


Part B has no magnetic field lines whereas part A and part C has magnetic lines since they are magnetic poles which determines the strength of their magnetic field. Hence part B is where the intensity of the magnetic field is almost zero or minimum.


More from this chapter

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13

If the image formed by a lens for all positions of an object placed in front of it is always erect an diminished, what is the nature of this lens? Draw a ray diagram to justify your answer.

If the numerical value of the power of this lens is 10 D, what is its focal length in the Cartesian system?

 14

Three 2Ω resistors A, B and C are connected as shown in figure. Each of them dissipates energy and can with stand a maximum power of 18 W without melting. Find the maximum current that can flow through the three resistors.


OR


Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2Ω in series with a combination of two resistors (4Ωeach) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2Ωresistor be same as that across the parallel combination of 4Ω resistors? Give reason.

 16

i. In the formation of compound between two atoms A and B, A loses two electrons and B grains one electron.

A. What is the nature of bond between A and B?


B. Suggest the formula of the compound formed between A and B.


ii. On similar lines explain the formation of MgCl2 molecule.


iii. Common salt conducts electricity only in the molten state. Why?


iv. Why is melting point of NaCl high?

 17

Elements forming ionic compounds attain noble gas configuration by either gaining or losing electrons from their outermost shells. Give reason to explain why carbon cannot attain noble gas configuration in this manner to form its compounds. Name the type of bonds formed in ionic compounds and in the compounds formed by carbon. Also give reason why carbon compounds are generally poor conductors of electricity.

OR


i. State the meaning of functional group in a carbon compound. Write the functional group present in (a) ethanol and (b) ethanoic acid and also draw their structures.


ii. Write the name and general formula of a chain of hydrocarbons in which an addition reaction with hydrogen can take place. Stating the essential conditions required for an additional reaction to occur write the chemical equation giving the name of the reactant and the product of such a reaction.