20.choose the correct statement.
i)Strong nuclear forces are charge independent
ii)Weak nuclear forces are charge independent
iii)Gravitational forces are charge independent
iv)All of these

Strong nuclear force is charge independent it doesn't depend on if it is neutron or proton . The force between neutron -neutron ,neutron -proton ,proton -proton is same only .
similiart weak nuclear force are also charge independent.
Gravitational force depend on the mass of the body .it's always attractive.it has no relation with charge on the body .
Option 4 is correct all of these

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