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THE MOLECULES NH3 AND NF3 HAVE DIPOLE MOMENTS WHICH ARE OF OPPOSITE DIRECTION

Due to more electronegativity of fluorine it also attract electrons towards it so, opposite in case of NF3
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This is because in NH3 nitrogen is more electronegative than hydrogen while in
NF3, nitrogen is less electronegative than fluorine.
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net dipole movement in NH3 is totally upwards whereas in NF3 there is dipole towards lone pair as well as electronegativity of fluorine and it cancels out . Hence net dipole movement in fluorine is less than that of hydrogen
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