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Quantum-Theory
Find the (a) maximum frequency (b) minimum wavelength of X-rays produced by 30 kV electrons.
Question Id: PH0000012 Question : Find the (a) maximum frequency (b) minimum wavelength of X-rays produced by 30 kV electrons. Answer : (a) Maximu…
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Environment
What is global warming? Write the cause of global warming?
Question Id: BIO000001 Question : What is global warming? Write the cause of global warming? Answer : Rising average air temperatures near Earth’s…
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Physics
A polythene piece rubbed with wool is found to have a negative charge of 3×10^{–7} C
Question 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…
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Physics
An electric dipole with dipole moment 4 × 10^{–9} C.m is aligned at 30° with the direction of a uniform electric field of magnitude 5 × 10^4 NC^{–1} . Calculate the magnitude of the torque acting on the dipole.
Question 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…
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Physics
Explain why two field lines never cross each other at any point?
Question Id: PH0000009 Question: Explain why two electrostatic field lines never cross each other at any point? Explanation: Electrostatic field li…
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Physics
Explain the meaning of the statement ‘electric charge of a body is quantised'.
Question Id: PH0000008 Question: Explain the meaning of the statement ‘electric charge of a body is quantised'. Answer : Charge( may be positi…
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Physics
Four point charges qA=2μC, qB=−5μC, qC=2μC, and qD=−5μC are located at the corners of a square ABCD of side 10 cm. What is the force on a charge of 1 µC placed at the centre of the square?
Question 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…
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Physics
The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in air is 0.2 N. (a) What is the distance between the two spheres? (b) What is the force on the second sphere due to the first?
Question 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…
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Physics
What is the force between two small charged spheres having charges of 2×10−7C and 3×10−7C placed 30cm apart in air ?
Question 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…
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Trigonometry
Express Sine(sin), Cosine(cos) and tangent(tan) in terms of sides of triangle
Question : Express Sine(sin), Cosine(cos) and tangent(tan) in terms of sides of triangle Answer : For a right angle triangle we can fi…
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Maths
A right angle triangle has a base of 25m and its area is 375m^{2} find its height
Question : 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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