7.2.1 Example 7

7.2.1 of Griffith's Introduction to Electrodynamics 2nd Ed
A ring of charge, with a magnetic field inside which does not touch the charges, will change its momentum when the magnetic field is turned off.
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[@idannemirovsky8888]

Why do we have a torque if the direction of the field is the same as the direction of the current?

[@rafanadhil]

hii, I watch this video along with reading the book, I guess you missed that the integral of E dl is E(2pi b) because the radius of the loop is not only to a
cmiiw

[@rafanadhil]

oh nvm my bad forgot about the R

[@rajdeeppaul4321]

Very pathetic explanation... I expect something new..

[@ryankim1999]

New? Electromagnetism and Electrodynamics has been the same for almost 200 years