Question

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Answer 1

23.

Magnetic lines of force are the lines that depict the magnetic force that exists in the surrounding of the magnet.

The properties of magnetic lines of force are as follows.

Magnetic field lines emerge from the north pole and merge at the south pole.

As the distance between the poles increases, the density of magnetic lines decreases.

The direction of field lines inside the magnet is from the South Pole to the North Pole.

Magnetic lines do not intersect with each other.

The strength of the magnetic lines is the same throughout and is proportional to how close are the lines.

24. FLHR

State Fleming’s Left-Hand Rule

State Fleming’s Left-Hand RuleFleming’s left-hand rule states that “When a current-carrying conductor is placed in an external magnetic field, the conductor experiences a force perpendicular to both the field and to the direction of the current flow.” It was invented by John Ambrose Fleming.

Answer 2

Answer:

21:- Resistance of a conductor depends upon:

(i)- Length of the conductor.

(ii)- Area of cross-section.

(iii)- Temperature.

(iv)- Nature of the material of the conductor.

Explanation:

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