7. MRI (Magnetic Resonance Imaging) uses strong magnetic fields to create pictur

Question

7. MRI (Magnetic Resonance Imaging) uses strong magnetic fields to create pictures of soft tissues inside people. The fields are produced using huge coils of wire (solenoids). Looking at Eq'n 24.4 on p776 (p. 788 2nd Ed.), explain what happens to the field if: a) the current in the coil is increased [1 mark] b) the radius of the coil is increased [1 mark] c) the number of turns is increased (keeping the length the same) [1 mark] d) Which of these do you expect is the most practical way to increase the field? [1 mark] Magnetic field inside a solenoid of length L with N turns

Explanation / Answer

a

increase

b

Remains same

c

incease

d

increasing number of turns or length

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