Question

lightning occurs when there is positive charge in both the clouds and earth or the negative charge in earth and positiv charge in cloud or positive charge and negative charge in cloud

Answer 1

lightning occur due to negative charge on cloud and positive charge on particles present at the Earth's surface

Answer 2

Heavier, negatively charged particles sink to the bottom of the cloud. When the positive and negative charges grow large enough, a giant spark - lightning -occurs between the two charges within the cloud. This is like a static electricity sparks you see, but much bigger.