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Conductivity and Resistivity

A solid spher...

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A solid spherical conductor of radius R has a spherical cavity of radius a(a

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Q. A solid spherical conductor of radius

R

has a spherical cavity of radius

a (a < R)

at its centre. A charge

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r (a < r < R)

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Q. A spherical conductor of radius

2 R

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\frac{R}{2}

. The cavity does not enclose the centre of sphere. Charges

Q_{1}

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Q_{2}

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Q_{3}

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Q. A solid spherical region, having a spherical cavity whose diameter

^{'} R^{'}

is equal to the radius of the spherical region, has a total charge

^{'} Q^{'}

. Find the electric field at a point

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Q. A sphere of solid material of specific gravity

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has a concentric spherical cavity and just sinks in water. The ratio of radius of cavity to that of outer radius of the sphere must be

Q. A sphere of solid material of relative density 9 has a concentric spherical cavity and just floats in water. If the radius of the sphere be R, then the radius of the cavity (r) will be related to R as:

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