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ICSE physics

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Question

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Explain the statement ‘Relative permittivity of water is 81’

Solution

$Relative space permittivity comma space straight K space equals space straight epsilon over straight epsilon subscript straight o space equals space straight F subscript mod over straight F subscript straight o$
For water K = 81;
This means the force between two charges in water is 81 times less than the force between charges in vacuum (or air).

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Draw (at least three) electric lines of force due to an electric dipole.

Solution

Electric lines of dipole.
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Find the value of resistance X in the circuit below so that the junctions M and N are at the same potential:

Solution

In the given figure,

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When the cold junction of a certain thermo-couple was maintained at 20°C, its neutral temperature was found to be 180°C. Find its temperature of inversion.

Solution

Q_n = $fraction numerator straight Q subscript 1 space plus space straight Q subscript 2 over denominator 2 end fraction$

Here,

Q_n = 180^o C ; Q_c = 20^o C

180^o =

fraction numerator straight Q subscript 1 space plus space 20 over denominator 2 end fraction

Q_i = 360 - 20 = 340^o C

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State how the magnetic susceptibility of a ferromagnetic material changes when it is heated.

Solution

When a magnetic material is heated its magnetic susceptibility decreases.

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