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Chapter 29: Q. 16 (page 830)

The on-axis magnetic field strength 10cmfrom a small bar magnet is 5.0渭罢.

a. What is the bar magnet鈥檚 magnetic dipole moment?

b. What is the on-axis field strength 15 cm from the magnet?

Short Answer

Expert verified

a. magnetic moment is 25mA.m2

b. Magnetic field strength will be1.48渭罢.

Step by step solution

01

Part (a) Step 1: Given information

We have given,

magnetic field strength =5渭罢

distance = 10cm

We have to find the magnetic moments.

02

Simplify

The magnetic field in of a bar magnet in terms of magnetic moment is given by,

B=渭0渭鈫�2蟺搁3渭鈫�=2蟺搁3B渭0渭鈫�=2蟺脳(0.1)3脳5脳10-64蟺脳10-7=25mA.m2

03

Part (b) Step 1: Given information

We have given,

distance = 15cm

We have to find the magnetic field strength.

04

Simplify

The magnetic field will be

B=渭0渭鈫�2蟺搁3B=(4蟺脳10-7)脳0.0252蟺脳(0.15)3B=1.48渭罢.

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