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CBSE Class 12-science Answered

what is intencity method  and inverse squre law of intencity
Asked by rajshekhar2718 | 15 Jul, 2019, 10:02: PM
answered-by-expert Expert Answer
Any point source which spreads its influence equally in all directions without a limit to its range will obey the inverse square law.
 
This comes from strictly geometrical considerations. The intensity of the influence at any given radius r is the
source strength divided by the area of the sphere. As we go far away radially in any direction, spherical surface at that radial distance
is 4πr2 , i.e. area increases as r2 if we move a distance r radially.  Hence intensity varies by 1/r2.
 
Being strictly geometric in its origin, the inverse square law applies to diverse phenomena.
 
Point sources of gravitational force, electric field, light, sound or radiation obey the inverse square law.
 
Answered by Thiyagarajan K | 17 Jul, 2019, 09:34: AM

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CBSE 12-science - Physics
A dumbbell consists of two masses A and B each of mass m joined by a light rod of length l with mass B attached to a suspension point O by a light rod of length l as shown in figure. Find the minimum required speed with which mass A to be projected horizontally so that the system completes the vertical circular motion.
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please resolve with good explanation
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explain
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which answer is correct and most appropriate with explanation
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