Question Id: PH0000012 Question : Find the (a) maximum frequency (b) minimum wavelength of X-rays produced by 30 kV electrons. Answer : (a) Maximu…
Read moreQuestion Id: BIO000001 Question : What is global warming? Write the cause of global warming? Answer : Rising average air temperatures near Earth’s…
Read moreQuestion Id: PH0000011 Question : A polythene piece rubbed with wool is found to have a negative charge of \(3×10^{–7} C\). (a) Estimate the numbe…
Read moreQuestion Id: PH0000010 Question : An electric dipole with dipole moment \(4\times 10^{-9} C.m\) is aligned at 30° with the direction of a uniform e…
Read moreQuestion Id: PH0000009 Question: Explain why two electrostatic field lines never cross each other at any point? Explanation: Electrostatic field li…
Read moreQuestion Id: PH0000008 Question: Explain the meaning of the statement ‘electric charge of a body is quantised'. Answer : Charge( may be positi…
Read moreQuestion Id: PH0000007 Question : Four point charges qA = 2 µC, qB = –5 µC, qC = 2 µC, and qD = –5 µC are located at the corners of a square A…
Read moreQuestion Id: PH0000006 Question : The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in air…
Read moreQuestion Id: PH0000005 Question : What is the force between two small charged spheres having charges of \(2\times 10^{-7}C\) and \(3\times 10^{-7}C…
Read moreQuestion : Express \(Sine(sin)\), \(Cosine(cos)\) and \(tangent(tan)\) in terms of sides of triangle Answer : For a right angle triangle we can fi…
Read moreQuestion : A triangle has a base of \(25m\) and its area is \(375m^{2}\) find its height? Answer : Height of the right angle triangle is \(30m\…
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