Answer
A) Positively charged two insulating rod are brought closed to an object they repel each other. It means the Object is positively charged. Because similar charge repel each other.
The correct answer is Option A.
B) we know force between to charges is calculated using Formula
.......(1)
form the given condition in the question
from equation (1)
hence, the correct answer is Option C.
Answer:
Its density decreases, and its volume increases
Explanation:
Density is defined as Mass/Volume. What happens when water transforms into ice is that its density decreases because the volume the molecules now occupy increases.
The denominator of the rational expression 
is now larger (while the numerator stays the same), so the quotient gives a smaller number.
Answer:
1) is to prevent accidental contact with other conductors of electricity
2) to prevent getting shocked
3) Plastic helps dissipate the heat as well as prevent the wire from getting too hot and causing fire.
4) Without plastic, hot and neutral wires cannot be run in the same conductor or same wire
Explanation:
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Answer:
A, B and C
Explanation:
Option A is correct because, the force on particle 1 depends on the electric field due to particle 2. Since the electric field due to particle 2 is the force per unit charge acting at the point of particle 1, the force at the point of particle 1 is the product of that electric field due to particle 2 and the charge on particle 1. So, Particle 2's electric field contributes to the electric force on particle 1.
Option B is correct because the force on a charge can only be exerted due to an external electric field. So, Particle 1's electric field does not contribute to the electric force on particle 1
Option C is correct since an electric field is always present in the region surrounding a charge irrespective of whether there is a charge in the region of the electric field or not. So, If particle 2 were removed, there would still be a non-zero electric field at its location.
