(a) Galvanometer as Ammeter (R_G = 60.00Ω):

Total resistance in the circuit:

\[ R_{total} = R_G + 3Ω = 63Ω \]

Current:

\[ I = \frac{3V}{63Ω} = 0.048A \]

(b) Shunted Galvanometer (r_s = 0.02Ω):

Resistance of converted ammeter:

\[ \frac{R_G \times r_s}{R_G + r_s} = \frac{60Ω \times 0.02Ω}{(60 + 0.02)Ω} ≈ 0.02Ω \]

Total resistance in the circuit:

\[ R_{total} = 0.02Ω + 3Ω = 3.02Ω \]

Current:

\[ I = \frac{3V}{3.02Ω} ≈ 0.99A \]

(c) Ideal Ammeter (Zero Resistance):

Total resistance in the circuit:

\[ R_{total} = 0Ω + 3Ω = 3Ω \]

Current:

\[ I = \frac{3V}{3Ω} = 1.00A \]