When a positive point charge moves in the direction of an electric field, the value of the electric potential energy U_electric __________. When this point charge moves opposite to the direction of electric field, the value of U_electric __________. When this point charge moves perpendicular to the direction of electric field, the value of U_electric __________.

(ii) When a negative point charge moves in the direction of an electric field, the value of the electric potential energy U_electric __________. When this point charge moves opposite to the direction of electric filed, the value of U_electric __________. When this point charge moves perpendicular to the direction of electric field, the value of U_electric __________.

(iii) When two positive point charges move toward each other, the value of the electric potential energy U_electric __________. When these point charges move away from each other, the value of U_electric __________. When these point charges move in such a way that the distance between then remains the same, the value of U_electric __________.

(iv) When two negative point charges move toward each other, the value of the electric potential energy U_electric __________. When these point charges move away from each other, the value of U_electric __________. When these point charges move in such a way that the distance between then remains the same, the value of U_electric __________.

(v) When a positive point charge and a negative point charge move toward each other, the value of the electric potential energy U_electric __________. When these point charges move away from each other, the value of U_electric __________. When these point charges move in such a way that the distance between then remains the same, the value of U_electric __________.