Answer:
4 N
Explanation:
Electrostatic force is directly related to the charge of each object hence when the charge is doubled in only one of the objects, the force also double. If it's doubles on both objects, the force becomes four times. In this case, it's doubled on one object hence 2*2= 4 N
Since hex means 6 from Greek, the answer is D) SF6
Answer:b-right
Explanation:
Given
current is flowing into the screen i.e.
direction
length of wire is also in
direction
Force experienced is in negative y direction i.e. 
Force experienced by a current carrying wire in a magnetic field experience a force is given by

where I=current
L=length of element
B=magnetic field
Direction of magnetic field must be in 
as 