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A pump can empty a 7.5 m deep and 0.9 m radius well in 30 mints.but the pump got damaged after emptying half of the well.?
a pump can empty a 7.5 m deep and 0.9 m radius well in 30 mints.but the pump got damaged after emptying half of the well. then another pump is used to empty the rest which can empty it in 15 mints.what is the ratio of the power of the two pump?

for the 2nd pump the time given here is it the time for emptying whole well or emptying the rest after the 1st one damaged?
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why to empty h meter deep fulfilled well, the height is used h/2?

why to raise water from a h meter deep fulfilled well, the height is used h?

why to empty the half of a fulfilled well which is h meter deep, the height is used h/4?

why to raise water from a h meter deep well which has water level at h/4 ,the height is used 3h/4?

what is the main concept? please xplain
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A)A sphere of radius R carries a charge of volume charge density p = cr, where c is a constant and r denotes the distance from the centre of the sphere. Calculate the total charge enclosed by the sphere and the electric field at points lying inside and outside the sphere. B) A dielectric object is placed in an electric field. The object becomes polarised and a large number of atomic /molecular dipoles in the object align in the direction of the applied electric field. Derive an expression for the electric field produced by this polarised dielectric at a point outside the dielectric object. C)Determine the magnitude of the pointing vector and the energy per unit time delivered to a wire of length L and cross-section A when electric current I flows in it.
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A)Do the following fields satisfy all four Maxwell's equations? E(t) = E0 sin x sin t. B (Vector) = B(vector) 0 cos x cos t. B)In a cyclotron, the diameter of the pole faces is 100 cm and the magnetic field between the pole faces is 0.60 T.The cyclotron is used for accelerating protons. Calculate the kinetic energy of proton in eV and speed of the proton as it emerges from the cyclotron. Also determine the cyclotron frequency. C)Obtain a relation between the refractive index and polarisability of a dielectric material.
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A)Using Biot-Savart Law,obtain an expression for the magnetic field along the axis of a current loop. B)In the Bohr model of hydrogen atom, the electron follows a circular orbit centred on the nucleus containing a proton. The motion of the electron along the circular orbit constitutes a current. Calculate the magnetic field produced by the orbiting electron at the site of the proton. C)A fuse in an electric circuit is designed to open the circuit like a switch when the current exceeds a preset value. If a fuse is made of material that melts when the current density reaches 400 A cm^2, what is the diameter of the wire needed to limit the current to 0.30 A?
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1)Assume that the electron in He+ ion is excited to the second orbit (n = 2).Calculate the following: I) the radius of the orbit. ii)the velocity of the electron. iii)the potential energy of the electron. iv)the kinetic energy of the electron. [HINT:use equations derived for hydrogen atom] 2) (a) explain the shapes of 1s and 2ps orbitals of an atom with one electron. (b) calculate the de Broglie wavelength of Li+ ion, if it moves with the velocity of 2 * 10^4 m S^-1. assume that the mass of Li+ ion is equal to two mass of Li atom.
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A cylinder of radius r and of thermal conductivity K1 is

surrounded by a cylindrical shell of inner radius r and outer radius 2r made of a material of thermal conductivity K2. The effective thermal conductivity of the system is??
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Let the charges Q and −Q be placed alternatively along the x-axis at positions x = 1 m, x = 3 m, x = 6 m and x = 9 m. What is the electric field at x = 0 due to these charges?
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Two electric charges 2 μC and –1 μC are placed at a distance of 20 cm from each other in vacuum. Locate the point on the line joining these two charges outside the region between them at which the electric potential is zero with reference to the positive charge.
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A fuse in an electric circuit is designed to open the circuit like a switch when the current exceeds a preset value. If a fuse is made of material that melts when the current density reaches 400 A cm2, what is the diameter of the wire needed to limit the current to 0.30 A?
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