8. A long straight wire lies on the y-axis. The wire sits in a uniform external

Question

8. A long straight wire lies on the y-axis. The wire sits in a uniform external magnetic field that points in the negative z direction. The net magnetic field at a point on the positive x axis is found to be zero, what can be said about the current in the wire?

(a) The current must be in the positive y direction.

(b) The current must be in the negative y direction.

(c) The current must be zero.

(d) This scenario is not possible.

9. A ferromagnet and electromagnet can be used together to

(a) Create a strong magnetic field.

(b) Create a weak magnetic field.

(c) Cancel any external magnetic fields.

(d) Create a heavy magnet.

10. A long straight wire lies on the z axis. The wire sits in a uniform external magnetic field that points in the negative y direction. The net magnetic field at a point on the positive x axis is found to be zero, what can be said about the current in the wire?

(a) The current must be in the positive z direction.

(b) The current must be in the negative z direction.

(c) The current must be zero.

(d) This scenario is not possible.

Explanation / Answer

8) On positive X- axis the magnetic field is in negative Z-axis so the current must be in negative Y-direction so that the induced magnetic field is in positive Z-direction on Positive X-axis.So

(b) Current must be in negative Y-direction.

9) A ferro magnet and Electro magnet together create a strong magnetic field. So

(a) Create a strong magnetic field.

10) (a) Current should be in positive z-direction , to induce magnetic field in positive y- direction on positive x-axis to cancel out the existing magnetic field in negative y-direction

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