Magnetic Effects of Electric Current class 10 notes | handwritten notes class 10

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Magnetic Effects of Electric Current class 10 notes | handwritten notes class 10 by ‪@rajansir6345‬
1. Why does a compass needle get deflected when brought near a bar magnet?
Solution:
The compass needle is a small magnet. When the compass needle is brought close to a bar magnet, the magnetic field lines of the compass needle interact with the magnetic field lines of the bar magnet, which causes the compass needle to deflect.
Draw magnetic field lines around a bar magnet.
Solution:
Magnetic field lines of a bar magnet emerge from the North Pole and terminate at the South Pole,
2. List the properties of magnetic field lines.
Solution:
The properties of magnetic field lines are as follows:
Magnetic field lines do not intersect with each other.
They emerge from the North Pole and terminate at the South Pole.
Inside the magnet, the direction of the field lines is from the South Pole to the North Pole.
3. Why don’t two magnetic field lines intersect each other?
Solution:
If two magnetic field lines intersect, then at the point of intersection, the compass needle shows two different directions, which is not possible. Hence they do not intersect with each other.
Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop
For the downward direction of the current, the direction of the magnetic field will be as if emerging from the table outside the loop and merging with the table inside the loop. Similarly, for current flowing in an upward direction, the direction of the magnetic field will be as if they are emerging from the table outside the loop and merging with the table inside the loop
. A positively-charged particle (alpha-particle) projected towards the west is deflected towards north by a magnetic field. The direction of magnetic field is
towards south
towards east
downward
upward
Solution:
The direction of the magnetic field can be determined using Fleming’s Left-hand rule. According to the rule, if we arrange our thumb, forefinger and the middle finger of the left hand right perpendicular to each other, then the thumb points towards the direction of the magnetic force, the middle finger the direction of current and the forefinger the direction of magnetic field. Since the direction of the positively charged particle is towards the west, the direction of the current will also be towards the west. The direction of the magnetic force is towards the north. Hence the direction of the magnetic field will be upward according to Fleming’s Left-hand rule.
1. State Fleming’s left-hand rule.
Solution:
Fleming’s Left-hand rule states that if we arrange our thumb, forefinger and middle finger of the left hand at right angles to each other, then the thumb points towards the direction of the magnetic force, the forefinger points towards the direction of the magnetic field and the middle finger points towards the direction of the current.
2. What is the principle of an electric motor?
Solution:
The working principle of an electric motor is based on the magnetic effect of current. A current-carrying conductor, when placed in a magnetic field, experiences force and rotates. The direction of the rotation of the conductor can be determined by Fleming’s Left-hand rule.
3. What is the role of split ring in an electric motor?
Solution:
The split ring plays the role of a commutator in an electric motor. The commutator reverses the direction of the current flowing through the coil after each half-rotation of the coil. Due to this reversal of current, the coil continues to rotate in the same direction.
Explain different ways to induce current in a coil.
Solution:
Following are the different ways to induce a current in a coil:
If the coil is moved rapidly between the two poles of a horseshoe magnet, an electric current is induced in the coil.
When a magnet is moved relative to the coil, an electric current is induced in the coil.
1. State the principle of an electric generator.
Solution:
An electric generator works on the principle of electromagnetic induction. In a generator, electricity is generated by rotating a coil in the magnetic field.
2. Name some sources of direct current.
Solution:
DC generators and cells are some sources of direct current.
3. Which sources produce alternating current?
Solution:
Power plants and AC generators are some of the sources that produce alternating current.
4. Choose the correct option.
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each
two revolutions
one revolution
half revolution
one-fourth revolution
Solution:
c. half revolution
When a rectangular coil is rotated in a magnetic field, the direction of th

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