Q. 25

Expert-verified
Found in: Page 831

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# Magnetic resonance imaging needs a magnetic field strength of . The solenoid is long and in diameter. It is tightly wound with a single layer of diameter superconducting wire. What size current is needed?

The current needed is

See the step by step solution

## Step 1: Given information

We have given,

Magnetic field strength =

Length =

Diameter =

We have to find the current through the solenoid.

## Step 2: Simplify

We know the magnetic field which is produced by uniform shape solenoid at its center.

The magnetic field is

where N is the no. of turns and L is the length of the solenoid.

Then current will be,