Answer the following questions:The earth...

Answer the following questions:The earth’s core Is known to contain Iron. Yet geologists do not regard this as a source of the earth’s magnetism. Why?

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Answer the following questions:The charged currents in the outer conducting regions of the earth’s core are thought to be responsible for earth’s magnetism. What might be the ‘battery’ (i.e., the source of energy) to sustain these currents?

Answer the following questions: The earth’s magnetic field varies from point to point in space. Does it also change with time? If so, on what time scale does it change appreciably?

Why do we often regard the potential of the earth to be zero?

Answer the following questions:The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion?

Answer the following questions:The earth may have even reversed the direction of Its field several times during its history of 4 to 5 billion years. How can geologists know about the earth’s field in such distant past?

Answer the following questions regarding earth’s magnetism:Geologists claim that besides the main magnetic N-S poles, there are several local poles on the earth’s surface oriented In different directions. How Is such a thing possible at all?

Answer the following questions regarding earth’s magnetism: In which direction would a compass free point to, If located right on the geographic north or south pole?

Answer the following questions regarding earth’s magnetism:The earth’s field, It Is claimed, roughly approximates the field due to a dipole of magnetic moment 8 xx 10^22 J "T1 located at Its centre. Check the order of magnitude of this number In some way.

MODERN PUBLICATION-TEXTUAL QUESTIONS-EXERCISE

Answer the following questions:The earth’s core Is known to contain Ir...
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For current entering at A, the electric field E(r at a distance r form...
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A material 'B' has twice the specific resistance of 'A'. A circular wi...
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The length of a given cylindrical wire is increased by 100%. Due to th...
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If a wire is stretched to make it 0.1% longer, its resistance of will
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An electric current is passed through a circuit containing two wires o...
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By increasing the temperature, the specific resistance of a conductor ...
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A strip of copper another of germanium are cooled from room temperatur...
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The difference in the variation o resistance with temperature in a met...
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The thermistors are usually made of
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The resistance of a bulb filmanet is 100Omega at a temperature of 100^...
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The resistance of a wire is 5 ohm at 50^@C and 6 ohm at 100^@C. The re...
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The resistance of hot tungsten filament is about 10 times the cold res...
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An electric bulb is rated 220 V and 100 W. when it is operated on 110 ...
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An 220 volt-1000 watt bulb is connected across a 110 volt mains supply...
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A heater coil is cut into two equal parts and only one part is now use...
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If in the circuit, power dissipation is 150 W, then R is
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A wire when connected to 220 V mains supply has power dissipation P1. ...
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The resistance of the series combination of two resistances is S. WHen...
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A 3 V battery with negligible internal resistance is connected in a ci...
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What will be the value of current through 2Omega resistance for the ci...
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