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Q.

The gravitational field in a region is given by g = (5i + 12j) N/kg the change in gravitational potential energy of a particle of mass 1 kg, when it is taken from the origin to a (7m,- 3m) is

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a

8J

b

3J

c

1J

d

5J

answer is C.

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Detailed Solution

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U=−∫0x Exdx+∫0y EydyU=−∫01 5dx+∫0−3 12dy

U=−[5(7−0)+12(−3−0)]=−[35−36]=−[−1]=+1 J

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