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Question

The following figure shows two shells of masses m1 and m2. The shells are concentric. At which point, a particle of mass m shall experience zero force?


A
A
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B
B
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C
C
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D
D
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Solution

The correct option is D D
As we know that the gravitational field inside a spherical shell is zero.

Point D is an internal point for both m1 and m2. Hence, the gravitational field at point D will be zero.

So, the force experienced by the particle at point D will be zero.

But the particle at point C will experience force due to m2 only because it lies inside the m1 and outside the m2.

Particles at points B and A will experience the force due to both masses m1 and m2 as they lie outside the shells.

Therefore, option (d) is correct.

Key Concept: The gravitational field inside a spherical shell is zero.

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