need help understanding what I did wrong

Incorrect 0.75 / 2 pts Question 17 minut A 1.56-V battery has an internal resistance of 0.120 0. What is the maximum current that can be drawn from this battery? 7.50 A 1.56 A O infinite (or at least 1000s of amps) O 0.190 A 0.190 A. You selected this answer. 13.0 A 1.5 / 2 pts Incorrect Question 18 A series circuit consists of a 12.0 V source of emf, a 3.35 mF capacitor, a 1,240 0 resistor, and a switch. What is the time constant for this circuit in sec? 103z 0.5/ 2 pts Question 19 - b In a series circuit consisting of a 12.0 V source of emf, a 2.00 mF capacitor, a 1.00 kQ resistor and a switch, what is the voltage across the capacitor at a time of one time constant t after the switch is closed? 6.32V 0.632V 8.65V 759V DD ke Incorrect Question 21 A long straight wire is carrying a current of 2.4 A in a region where a uniform magnetic field is perpendicular to the wire. If the magnetic field is 0.52 mT, what is the magnitude of the force on 3.0 m of the wire? O .7.2 N 1.2 x 10-3 N O 3.7 N 7.2 x 10-3 N O 3.7 x 10-3 N Incorrect Question 22 1 / 2 pts A singly charged positive ion has a mass of 10 x 10-20 kg. After being accelerated through a potential difference of 218 V, the ion enters a magnetic field of 1.46 T, in a direction perpendicular to the field. Calculate the radius of the path of the ion in the field in mm (milli)? 1.49