Understanding the Magnetic Field of a Current Loop: True or False?

[GeorgeCostanz]

Homework Statement

Answer the following with regard to the current loop shown in the figure.

http://i.imgur.com/Lkp4D.gif

TRUE OR FALSE:

The B Field at C points into the plane of the paper.

If an external magnetic field directed out of the plane of the paper were introduced, the torque on the coil would be zero.

The magnetic moment of the loop points into the plane of the paper.

The B field inside the loop points out of the plane of the paper.

The coil behaves like a bar-magnet with its axis along the plane of the paper.

The B Field at B is greater than at A.

Homework Equations

The Attempt at a Solution

The B Field at C points into the plane of the paper. (T)

If an external magnetic field directed out of the plane of the paper were introduced, the torque on the coil would be zero. (F)

The magnetic moment of the loop points into the plane of the paper. (F)

The B field inside the loop points out of the plane of the paper. (F)

The coil behaves like a bar-magnet with its axis along the plane of the paper. (T)

The B Field at B is greater than at A. (T)

i hate the right hand rule

 

[PeterO]

Homework Statement

Answer the following with regard to the current loop shown in the figure.

http://i.imgur.com/Lkp4D.gif

The B Field at C points into the plane of the paper.

If an external magnetic field directed out of the plane of the paper were introduced, the torque on the coil would be zero.

The magnetic moment of the loop points into the plane of the paper.

The B field inside the loop points out of the plane of the paper.

The coil behaves like a bar-magnet with its axis along the plane of the paper.

The B Field at B is greater than at A.

Homework Equations

The Attempt at a Solution

The B Field at C points into the plane of the paper. (T)

If an external magnetic field directed out of the plane of the paper were introduced, the torque on the coil would be zero. (F)

The magnetic moment of the loop points into the plane of the paper. (F)

The B field inside the loop points out of the plane of the paper. (F)

The coil behaves like a bar-magnet with its axis along the plane of the paper. (T)

The B Field at B is greater than at A. (T)

i hate the right hand rule

Your suggestions T, F, F, F, T, T

I don't agree with many, but cannot see the diagram and answers at the same time.

I agree with the first, but very few of the rest - i think

 

[GeorgeCostanz]

sorry, it's a true or false question
6 statements

 

[PeterO]

Homework Statement

Answer the following with regard to the current loop shown in the figure.

http://i.imgur.com/Lkp4D.gif

TRUE OR FALSE:

The B Field at C points into the plane of the paper.

If an external magnetic field directed out of the plane of the paper were introduced, the torque on the coil would be zero.

The magnetic moment of the loop points into the plane of the paper.

The B field inside the loop points out of the plane of the paper.

The coil behaves like a bar-magnet with its axis along the plane of the paper.

The B Field at B is greater than at A.

Homework Equations

The Attempt at a Solution

The B Field at C points into the plane of the paper. (T)

If an external magnetic field directed out of the plane of the paper were introduced, the torque on the coil would be zero. (F)

The magnetic moment of the loop points into the plane of the paper. (F)

The B field inside the loop points out of the plane of the paper. (F)

The coil behaves like a bar-magnet with its axis along the plane of the paper. (T)

The B Field at B is greater than at A. (T)

i hate the right hand rule

Was the loop of wire actually that crazy shape, or did you just have trouble drawing a circle?

 

[GeorgeCostanz]

haha na that's the shape

 

[PeterO]

Homework Statement

Answer the following with regard to the current loop shown in the figure.

http://i.imgur.com/Lkp4D.gif

TRUE OR FALSE:

The B Field at C points into the plane of the paper.

If an external magnetic field directed out of the plane of the paper were introduced, the torque on the coil would be zero.

The magnetic moment of the loop points into the plane of the paper.

The B field inside the loop points out of the plane of the paper.

The coil behaves like a bar-magnet with its axis along the plane of the paper.

The B Field at B is greater than at A.

Homework Equations

The Attempt at a Solution

The B Field at C points into the plane of the paper. (T)I also think True

If an external magnetic field directed out of the plane of the paper were introduced, the torque on the coil would be zero. (F)I think True

I am assuming the magnet is taken away again before the following

The magnetic moment of the loop points into the plane of the paper. (F)?

The B field inside the loop points out of the plane of the paper. (F)I think true

The coil behaves like a bar-magnet with its axis along the plane of the paper. (T)I think false

The B Field at B is greater than at A. (T)This is definitely false if the loop is a perfect circle - suspect it is still false here but not as convinced

i hate the right hand rule

My interpretations

 

[GeorgeCostanz]

well the answers ended up being:

True: The B Field at C points into the plane of the paper.

True: If an external magnetic field directed out of the plane of the paper were introduced, the torque on the coil would be zero.

False: The magnetic moment of the loop points into the plane of the paper.

True: The B field inside the loop points out of the plane of the paper.

False: The coil behaves like a bar-magnet with its axis along the plane of the paper.

True: The B Field at B is greater than at A.

i got messed up on the bar-magnet question, could have sworn my professor told us it was true

and I'm guessing the b-field inside the loop would be using the right hand rule, placing your thumb on the underside of the current (thinking 3-D) and your fingers as the b-field point outwards

no idea why my brain is struggling to compute these simple right hand rules