The answer is mass. I have to comment more than 20 characters.
Explanation:
direction of electric field is same as that of force experienced by the test charge
Mass of the displaced material. In water it would be the mass of the water that the volume of the ball displaces.
Answer:
sum of these two vectors is 6.06i+3.5j-3.5i+6.06j = 2.56i+9.56j
Explanation:
We have given first vector which has length of 7 units and makes an angle of 30° with positive x-axis
So x component of the vector 
y component of the vector 
So vector will be 6.06i+3.5j
Now other vector of length of 7 units and makes an angle of 120° with positive x-axis
So x component of vector 
y component of the vector 
Now sum of these two vectors is 6.06i+3.5j-3.5i+6.06j = 2.56i+9.56j
False, applied force is when a person or an object pushes on another object