A current is used to charge a capacitor. After the capacitor has been charged, the magnetic field between the plates is
A) given by $B = \frac { \mu _ { 0 } I } { 2 \pi r }$
B) given by $B = \frac { \mu _ { 0 } I ^ { 2 } } { 2 \pi r }$
C) given by $B = \frac { \mu _ { 0 } I } { 2 \pi r ^ { 2 } }$
D) zero.

Question

Quizplus · Accepted Answer

After a capacitor has been fully charged, there is no current flowing between its plates, and therefore, no magnetic field is generated between the plates. Magnetic fields are produced by moving electric charges (currents), and in the absence of a current, there is no magnetic field.

A Current Is Used to Charge a Capacitor B=μ0I2πrB = \frac { \mu _ { 0 } I } { 2 \pi r }B=2πrμ0​I​

A Current Is Used to Charge a Capacitor $B = \frac { \mu _ { 0 } I } { 2 \pi r }$