Tension in the rope is "400 N".
Tension is the force developed inside a flexible material or medium, such as a cable, wire, or rope. This force depends upon the externally applied load. In the case of equilibrium, the tension in a rope or string is equal to the load applied to the rope or string, externally.
Since the steel ball and the rope system is in equilibrium in our case. Therefore, the tension in the rope must be equal to the load (weight) of the steel ball:
Tension = Weight of Steel Ball
Tension = 400 N
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The attached picture shows the tension on a steel ball hung by a rope.
