Hello, happy new year. pls help me.

Could you please tell me the words and phrases that apply to (1) to (6)? (In the case of a numerical value, it is 3 significant digits.)
The figure shows an inverting amplifier circuit using an operational amplifier. The gain of this circuit is (1)___ times. The potential at point a in the figure with respect to ground always has the property of being almost (2)___ volts regardless of the input, and this property is called (3)___

For this reason, current flows through the input circuit, and the magnitude of the input impedance is about (4)___ ohms, which is not large at all, so care must be taken. If terminal A is grounded and terminal B is used as the input terminal, this circuit will be a non-inverting amplifier and its gain should be (5)___ times. The input impedance in that case is considered to be almost (6)___ times.

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

490 n  f=125n a=2.5m/s2

Answer: a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same sign as the  -4.0  µc charge.======electricstatic force between two point charges  is given by    where k is coulomb's constant,  8.99×10⁹  n·m²/c², q₁ and q₂ are the point charges, and r is the distance between the two point charges.assign positive to q₁let q₁ =  6.0 µc, q₂ = -4.0  µc, q₀ represent the charge at the origin, and q₃ represent this new charge to place.the charge at the origin q₀ would experience the following force f₀₁ from q₁, with r = 6.0 m (note that 1  µc = 10⁻⁶ c)    the force from q₂    the force from q₃    the net force on the origin charge, q₀, has to be zero for no electrostatic forcehaving an equation where k and q₀ can be divided out of the equation will allow us to solve for q₃    isolating:     a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same as the  -4.0  µc charge