Paheli set up an experiment using liquid A in the beaker as shown in figure below

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cbse-class-8-science
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#1

Paheli set up an experiment using liquid A in the beaker as shown in figure below. She observed that the bulb glows. Then she replaced the liquid A by another liquid B. This time the bulb did not glow. Boojho suggested replacing the bulb by an LED. They observed that the LED glows. Explain.
image
Answer:
The current through liquid B could be weak and therefore unable to make the bulb glow. However, it was strong enough for the LED to glow.