A galvanometer is a sensitive instrument that gives a reading proportional to the current that ows through it. If such an instrument has a built-in (internal) resistance of 200 Ohms and requires a current of 5:0mA for full-scale reading, what resistance should be connected in parallel with this galvanometer to make it function as an ammeter that reads 10A when the reading is full-scale?

1) 400 Ohm

2) 0.2 Ohm

3) 0.1 Ohm

4) 4.105 Ohm