(a) A solenoid is formed of a length of wire that carries a constant current I.The solenoid has 68 turns of wire per cm. The magnetic field at the center of the solenoid is measured to be 25 G. (3 marks) Tube Battery Switch www.MiniScience.com The current through the solenoid in (A): (b) A length of wire is formed into a solenoid with n turns of wire per millimetre. The wire carries a constant current I. The magnetic field at the center of the solenoid is B. Which of the following changes would decrease the magnetic field strength at the center of the solenoid, assuming everything else remains constant? Explain why? (2 marks) A. Decreasing the length of the solenoid by removing turns of wire while keeping n constant B. Decreasing I, the current in the wire C. Increasing n2, the number of turns of wire per millimetre D. Increasing I, the current in the wire E. Increasing the length of the solenoid by adding turns of wire while keeping n constant

(a) A solenoid is formed of a length of wire that carries a constant current I.The solenoid has 68 turns of wire per cm. The magnetic field at the center of the solenoid is measured to be 25 G. (3 marks) Tube Battery Switch www.MiniScience.com The current through the solenoid in (A): (b) A length of wire is formed into a solenoid with n turns of wire per millimetre. The wire carries a constant current I. The magnetic field at the center of the solenoid is B. Which of the following changes would decrease the magnetic field strength at the center of the solenoid, assuming everything else remains constant? Explain why? (2 marks) A. Decreasing the length of the solenoid by removing turns of wire while keeping n constant B. Decreasing I, the current in the wire C. Increasing n2, the number of turns of wire per millimetre D. Increasing I, the current in the wire E. Increasing the length of the solenoid by adding turns of wire while keeping n constant