Force on a Current-Carrying Wire in a Magnetic Field

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Questions and Answers

What is the magnitude of the force on a wire carrying a current I in a uniform magnetic field B proportional to?

The square root of the current I

The difference between the current I and the magnetic field B

The product of the current I, the magnetic field B, and the length of the wire (correct)

The ratio of the current I to the magnetic field B

In which direction does the palm of your right hand face when using the right-hand rule?

In the direction of the force acting on the wire (correct)

In the direction perpendicular to the plane containing the conductor and the magnetic field

In the direction of the conventional current

In the direction of the magnetic field

What is the condition for the force on a current-carrying conductor to be greatest?

When the conductor is perpendicular to the plane containing the magnetic field

When the conductor is at right angles to the magnetic field (correct)

When the conductor is parallel to the magnetic field

When the conductor is in the same direction as the magnetic field

What is the direction of the magnetic force on a current-carrying wire in a magnetic field?

Perpendicular to the conductor and the magnetic field Signup and view all the answers

What is the expression for the force on a wire carrying a current I with length L in a uniform magnetic field B?

F = ILB sin θ Signup and view all the answers

What is the relationship between the force on a current-carrying wire and the angle θ between the current direction and the magnetic field?

The force is directly proportional to sin θ Signup and view all the answers

What is the primary function of the kinetochore in prophase?

To attract and bind mitotic spindle microtubules Signup and view all the answers

During metaphase, where are the chromosomes aligned?

At the metaphase plate or equatorial plane Signup and view all the answers

What happens to the nuclear envelope during prophase?

It starts to dissociate into small vesicles Signup and view all the answers

What is the main event during anaphase?

Sister chromatids separate and move to opposite poles Signup and view all the answers

What happens to the chromosomes during telophase?

They begin to decondense Signup and view all the answers

What is the role of centrosomes during prophase?

They move to opposite poles of the cell Signup and view all the answers

What happens to organelles like the Golgi complex during prophase?

They disperse towards the periphery of the cell Signup and view all the answers

What is the primary function of mitotic spindle microtubules?

To move chromosomes towards the poles Signup and view all the answers

Study Notes

Force on a Current-Carrying Wire in a Magnetic Field

The force on a wire is directly proportional to the current I, magnetic field B, and length of wire exposed to the magnetic field.
The force also depends on the angle θ between the current direction and the magnetic field.
The force on a wire carrying a current I with length L in a uniform magnetic field B is given by: F = ILBsin θ.
The direction of the magnetic force on a current-carrying wire can be found using the right-hand rule:
- Point fingers in the direction of B.
- Point thumb in the direction of the conventional current in the wire.
- The palm of the hand then faces or pushes in the direction of the force acting on the wire.

Characteristics of the Force

The force is always perpendicular to the plane containing the conductor and the direction of the field.
The force is greatest when the conductor is at right angles to the field.

Mitosis

Prophase: nuclear envelope dissociates into small vesicles, chromosomes condense and become visible under a compound microscope, centrosomes move to opposite poles.
Chromosomes coil tightly, develop a kinetochore in the centromeric region, and attract mitotic spindle microtubules from centrosomes.
Organelles like the Golgi complex and endoplasmic reticulum fragment and disperse toward the cell periphery.

Metaphase

Chromosomes align at the metaphase plate (equatorial plane) at the cell's middle, sister chromatids still tightly attached to each other.

Anaphase

Sister chromatids separate at the centromere and are pulled rapidly toward the centrosome to which its microtubule is attached.
Connection between sister chromatids breaks down, and microtubules pull chromosomes toward opposite poles.

Telophase

Chromosomes reach opposite poles and begin to decondense (unravel).
Mitotic spindles depolymerize, nuclear envelopes form around chromosomes, and nucleosomes appear within the nuclear area.

Cytokinesis

Final phenomenon where the division of the cell is completed by the physical separation of the cytoplasmic components, resulting in two genetically identical daughter cells.

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Description

Learn about the force on a wire in a magnetic field, its dependency on current, magnetic field, and length, and how to calculate it using the formula F = ILBsin θ.