Physics
In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to

10 N
100 N
1 N
0.1 N

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Physics
Isotopes of an element contain

equal number of nucleons
equal number of protons and electrons
the same number of protons but different number of neutrons
the same number of neutrons but different number of protons

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