Help!!!!

A current-carrying coil uses a battery that supplies 50V of potential difference to the coil while its total resistance is 2.0ohms. What is... a) The current in the coil. b The direction of the magnetic field inside the iron piece (left or right). c) The magnitude of the magnetic field 2 cm above the coil in milliTesla? d.)The direction of the magnetic field 2cm above the coil ( left or right)