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# A sphere of mass M and Radius R_{2} has a concentric cavity of Radius R_{1} as shown in figure. The force exerted by the shpere on a particle of mass located at a distance from the center of shhere varies as

## The correct answer is:

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### is decreasing in

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We should know the formulas of differentiation. And, we should know the condition for increasing and decreasing function.

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### The interval of increase of the function is

For such questions, we should know different formulas of differentiation.

### The interval of increase of the function is

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For such questions, we should know different formulas of differentiation.

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### In experiment of the potentiometer wire of length 100 cm has a resistance of 10, It is connected in series with a resistance R and a cell of emf 2 volts and of negligible internal resistance. A Source of emf 10mV is balanced against a length of 40 cm of the potentiometer wire. What is the value of the external resistance?

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For such questions, we should check the rules of increasing and decreasing function.

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For such questions, we should check the rules of increasing and decreasing function.

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