2.7 What are the electric field and potential at the
centre of a square whose diagonals are 60 cm
each when (a) charges each of 2uc are placed at
the four corners. (b) charges of + 2uc are placed
on the adjacent comers and - 4uc on other cor.
ners.
3

Janelle made a hypothesis bout the uneven temperatures inside her house during winter. she believes that 50% of the ducts are blocked and she plans to investigate. if she wants to prove her hypothesis using scientific processes what should she do next?

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air

In which type of system is power held solely by the central government and not shared with regional governments? group of answer choices federal unitary confederate oligarchic