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The molecular theory of magnetism was given by Weber and modified later by Ewing. According to that theory - Each molecule of a substance is a complete magnet in itself. Though,
define like and unlike parallel forces
Component Addition of vector We learned in which vectors oriented at right angles to one another could be added together by using the Pythagorean Theorem. For example, two disp
Intensities of an ordinary light and laser light The intensity (I) of a wave is the energy per unit time flowing through a unit normal area. The light from an ordinary light so
Necessity Of A Starter For D.C Motors When motor is at rest, then N=0 and due to Eb is directly proportional to N, so At begin E b = zero Thus armature current at t
As electric field is conservation, work done and as potential difference among two points is path independent and depends only on the position of points between which the charge is
What is Refraction
A step-up transformer works on 220V and gives 2A to an external resistor. The turn ratio between the secondary and primary coils is 2 : 25. Assuming 100% efficiency, Determine the
A steel ring of mean diameter 120mm is uniformly woundwith 1500 turns of wire. When a current of 0.30A is passed by the coil a flux density of 1.5 T is set up in the steel.
A plane monochromatic wave travelling in a homogeneous medium goes into a denser medium. What are the changes in (i) Frequency (ii) amplitude (iii) speed of propagation & (iv) Phas
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