14) The mass of a planet is 1 25 th of the mass  of the earth . The distance between the planet and the earth is 6 × 10 8 m. At what distance from the earth , the gravity becomes zero
1) 1 × 10 4 m
2) 0 . 32 ×   10 m 4
3) 5 ×   10 4   m
4) 0 . 032   ×   10 4   m

Dear Student,

Given - MP=125ME   , Distance between the earth ans planet is r=6×108mLet at a distance x from the earth gravity which means gravitatioal field becomes zero thendistance from the planet will be (r-x).for zero field-I1=I2GMEx2=GMP(r-x)2    GMEx2=125GME(r-x)2take square root of both side-1x=15(r-x)      x=5r6=5(6×108m)6=5×108m r=5×108m 

Regards

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