The number of nodal planes 'd' orbital has &nbsp;

If somehow the distance between the sun and the earth is doubled, the gravitational force between them will become :

A tunnel is dug along a diameter of earth of mass Me and radius Re . Force on a particle of mass 'm' placed in the tunnel at a distance 'r' from the centre is :

A number of point masses each equal to 'm' are arranged along x-axis at &nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">x</mi><mo>=</mo><mn>1</mn><mi mathvariant="normal">m</mi><mo>,</mo><mo>&nbsp;</mo><mi mathvariant="normal">x</mi><mo>=</mo><mn>2</mn><mi mathvariant="normal">m</mi><mo>,</mo><mo>,</mo><mo>&nbsp;</mo><mi mathvariant="normal">x</mi><mo>=</mo><mn>4</mn><mi mathvariant="normal">m</mi><mo>,</mo></math>&nbsp;and so on. Another mass M is placed at the origin. Force experienced by 'M' due to infinite point masses is

Four particles each of mass ‘m’ are located at the four corners of a square of side ‘a’. If the system is revolving in a uniform circle due to their mutual force of attraction, then the angular velocity of each particle is

The number of nodal planes 'd' orbital has

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