Answer:
 E_total = 1.30 10¹⁰ C / m²
Explanation:
The intensity of the electric field is
      E = k q / r²
on a positive charge proof
The total electric field at the midpoint is
as q₁= 6 10⁻⁶ C the field is outgoing to the right
for charge q₂ = -3 10⁻⁶ C, the field is directed to the right, therefore
 E_total = E₁ + E₂
 E_total = k q₁ / r₁² + k q₂ / r₂²
 r₁ = r₂ = r = 4 10⁻² m
 E_total = k/r² (q₁ + q₂)
  we calculate
E_total = 9 10⁹ / (4 10⁻²)²   (6.0 10⁻⁶ +3.0 10⁻⁶)
 E_total = 1.30 10¹⁰ C / m²
 
        
             
        
        
        
Answer: 75V
Explanation:
Given that,
total resistance (Rtotal) = 150Ω 
Current (I) = 0.5A 
Change in electric potential (V) = ?
Recall that potential difference is the product of amount of current and the amount of resistance in the circuit. And its unit is volts.
So, apply the formula V = I x Rtotal 
V = 0.5A x 150Ω
V = 75V
Thus, the change in electric potential across the circuit is 75 Volts
 
        
             
        
        
        
F=W=mg
12N(given)= m*9.8 
m= 1.22 kg
        
             
        
        
        
Which way is it being pulled?