Question

Describe the magnetic field generated from a loop of current formed by pressing the ends of...

Describe the magnetic field generated from a loop of current formed by pressing the ends of magnet wire to both terminals of an AA battery. You may use words and/or sketches to illustrate. Refer to content in the textbook, "Magnetic Field Produced by a Current-Carrying Circular Loop".

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Answer #1

The loop works in the same way as any current carrying wire. However, The magnetic field direction is different inside and outside the loop. Due to this , there may be varying force along the sides of loop. The magnetic field intensity can be increased using more number of turns.

Here is a diagram

the loop shown above is a circular loop with counter clockwise current. Now, if we apply right hand rule, the we see that magnetic field is out of the page inside the loop and into the page outside the loop. This is really helpful if we want to know if there is any torque or magnetic moment acting on the loop.

Also, varying the current in the loop will change the magnetic field which will produce emf in the coil. These concepts are used in electromagnetic induction.

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