Q.4
Two point charge qp=+2^C and qq =-2°C are placed at a
distance of 10 cm in air/vacuum.
(a) Calculate the electric field intensity along the center of line
joining the two chages.
(b) If a test charge qr= -1.2x10-°C is placed at center of the
PQ write the value of force acting on test charge qr and
its direction.
Answers
Explanation:
When scientists first studied the structure of nerve cells that comprise the human brain, they noted their strong resemblance to trees. In fact, dendrites, the term to describe projections from a nerve cell, comes from the Greek word Dendron, for “tree.” While the connection in the appearance of nerve cells was made to trees, the comparison may have been more apt than originally realized: scientists are starting to uncover that trees have their own sort of nervous system that is capable of facilitating tree communication, memory and learning.
Forests are complex systems
Forests cover 30% of Earth’s land surface and hold over a billion trees. Forests are known as “carbon sinks” because trees absorb carbon dioxide from the air, store the carbon in their trunks, and exhale oxygen. Scientist have leveraged this property to measure the ratio between two naturally occurring forms of carbon (12carbon and 14carbon) to assign an age to trees, a technique termed carbon dating. Using this technique, scientists found that trees living in forests, like the tree colony called Pando, tend to live longer than trees living in urban environments, often in isolation. Dendrologists, scientists who study wooded plants, thought that perhaps trees that lived together were helping each other by sending resources through their roots. To test this out in North American forests, dendrologists utilized a technique called isotope tracing. In this experiment, scientists injected carbon dioxide gas replaced with radiolabeled 14carbon into the trunk of Birch trees (Figure 1). When nearby Fir trees were covered by shaded cloth, to block their ability to acquire nutrients through photosynthesis, scientists found a higher level of radiolabeled 14carbon in their trunk, meaning they must have received sugars from the Birch. These experiments confirmed that trees are indeed communicating with each other and sharing nutrients through their roots, forming a complex system sometimes referred to as the “wood wide web.”