The correct answer is Both (ii) and (iii) are correct.Concept:Magnetic field (B):The area around a magnet where a magnetic force is experienced is called the magnetic field.It is a quantity that has both direction and magnitude, (i.e., Vector quantity).Explanation:Magnetic field due to a current-carrying coil:It is directly proportional to the current passing through the coil i.e., B ? IIt is directly proportional to the number of turns of the coil i.e., B ? n The direction of the magnetic field can be found with the help of the right-hand thumb rule. Statement True/ false B ? n2 False B ? ITrue Directions can be found using right - hand thumb rule. True Additional InformationRight-hand thumb rule: According to Maxwell's right-hand thumb rule if we tend to hold a straight current-carrying wire in our right hand such that our thumb represents the direction of the current then the curls of our fingers would represent the direction of the magnetic field lines.