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प्रश्न
Classify the following amongst contact and non - contact forces:
Frictional force
Normal reaction force
Force of tension in a string
Gravitational force
Electrostatic force
Magnetic force
उत्तर
Contact force: (a) frictional force (b) normal reaction force (c) force of tension in a string
Non-contact force: (d) gravitational force (e) electric force (f) magnetic force
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