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Find the  (a) maximum frequency (b) minimum wavelength of X-rays produced by 30 kV electrons.
What is global warming? Write the cause of global warming?
A polythene piece rubbed with wool is found to have a negative charge of \(3×10^{–7} C\)
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.
Explain why two field lines never cross each other at any point?
Explain the meaning of the statement ‘electric charge of a body is quantised'.
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?
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?
What is the force between two small charged spheres having charges of 2×10−7C and 3×10−7C placed 30cm apart in air ?
Express \(Sine(sin)\), \(Cosine(cos)\) and \(tangent(tan)\) in terms of sides of triangle
A right angle triangle has a base of \(25m\) and its area is \(375m^{2}\) find its height