moment o f'area of ellipse formula equation

is known as the torque of the applied force about an axis which passes through O and is perpendicular to the X-Y plane. The torque measures the turning or twisting effect of force. The torque is called as the moment of force. Expression for force can be written in terms of an..

1 and F 2 about O are equal and opposite. The moment of force due to F 1 = 6 N x 10 m = 60 N m This moment would cause the body to turn in the clockwise direction. The moment of force due to F 2 = 15 N x 4 m = 60 N m..

Molecules having two equal and opposite charges separated by certain distance are said to possess an electric dipole. In the case of such polar molecules, the centre of negative charge does not coincide with the centre of positive charge. The extent of polarity in such covalent molecules can be des..

Anti-ferromagnetic substances are expected to possess paramagnetism or ferromagnetism on the basis of unpaired electrons present in them but actually they possess zero net magnetic moment. This is because of the alignment of dipoles is in a compensatory way so as to give a net zero dipol..

If there is no net dipole moment it is said to be an antiferroelectric crystal. This is because the dipoles are alternately arranged. Example: (PbZrO 3 ) Lead zircona..

Ferrimagnetic substances are expected to possess large magnetism on the basis of the number of unpaired electrons present in them, but actually have small net magnetic moment. This is because the moments are aligned in parallel and anti-parallel directions in unequal numbers re..

2 hybrid carbon of an aromatic ring. The bond angle This is due to partial double bond character on account of the conjugation of unshared electron pair of oxygen with the aromatic ring..

The C - O bonds in ether are polar and thus ethers have a net dipole moment. The weak polarity of ethers do not appreciably affect their boiling points which are comparable to those of the alkenes of comparable molecular mass. Ethers have much lower boiling points as compared t..

Dielectrics and Polarisation - Dielectrics are non-conducting substances, they have no charge carriers or no free electrons. If an external field is applied, it turns out that charges are induced on the surface which in turn produces a field and opposes the external field. The opposing field does n..

Pure water is transparent, tasteless, colourless and odourless. It readily picks up the flavour of any substance dissolved in it. Water in thick layers appears greenish blue. Due to the presence of intermolecular hydrogen bonding in H 2 O molecules, the freezing point, boiling point,..