If 20 J of energy is trapped at the producer level, then how much energy will be available to eagle as food in the following food chain?

Plant → Rabbit→ Snake → Eagle

0.02 J

According to 10% law of energy flow, eagle will receive 0.02 J of energy as top consumer.

Energy received by the organisms at different trophic level can be seen as follows

Plant → 20J

Rabbit → 20 ×10% =2 J

Snake → 2 ×10% =0.2 J

Eagle → 0.2 ×10% =0.02 J