Question

2 objects of 4C & –9C are placed 1 m from each other. At what distance from the 4C will the electric field be zero ?

Answer 1

The electric field will be zero at a point where the forces exerted by charges 4q and q on a test charge q

0

are equal and opposite. Let this point be at a distance x from 4q, then its distance from q=30−x. If F

1

is force due to 4q and F

2

due to q, then F

1

=F

2

,

i.e.,

4πϵ

0

1

x

2

4q×q

0

=

4πϵ

0

1

(30−x)

2

q×q

0

(or)

x

2

4

=

(30−x)

2

1

⇒2(30−x)=x

(or) x=20cm.

Answer 2

Answer:

the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product