Question

A stretching force of $10N$ is applied at one end of a spring balance and an equal force is applied at the other end in the opposite direction at the same time. The reading of the balance is:

• A. $5N$
• B. $10N$
• C. $20N$
• D. $0$

Answer 1

The correct option is B $10N$

Actual Scenario :
Tension in the spring $=10N$
Opposite force in the spring $=10N$
Modified Scenario :
The opposite force is replaced by the force that is acting in the same direction.Here equal and opposite forces are applied on the spring, hence it will remain in the stretched position and the total force acting on it is $10N$
Reading in the spring balance $=10N$