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प्रश्न
State Fleming’s left hand rule.
Name and state the law used to find the direction of force on a current carrying conductor kept in a magnetic field.
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उत्तर १
According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of the current, then the thumb will point in the direction of motion of the conductor or the force acting on the conductor.
उत्तर २
Stretch the forefinger, the middle finger, and the thumb of the right hand, such that they are mutually perpendicular to each other. If the forefinger indicates the direction of the magnetic field, the middle finger indicates the direction of current in the conductor, and the thumb indicates the direction of force exerted on the conductor.
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संबंधित प्रश्न
The magnetic field in a given region is uniform. Draw a diagram to represent it.
State the rule to determine the direction of a force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.
Observe the following figure:
If the current in the coil A is changed, will some current be induced in the coil B? Explain.
Describe how you will locate a current-carrying wire concealed in a wall.
The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of circular wire is:
(a) clockwise
(b) downwards
(c) anticlockwise
(d) upwards
A current-carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should passed in the conductor:
(a) from top towards bottom
(b) from left towards right
(c) from bottom towards top
(d) from right towards left
The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is:
45°
60°
90°
180°
What is the force on a current-carrying wire that is parallel to a magnetic field? Give reason for your answer.
Name and state the law which is used to determine the direction of force on a current carrying conductor placed in a magnetic field.
How will the direction of force be changed, if the current is reversed in the conductor placed in a magnetic field?
Name and state the rule of determine the direction of force experienced by a current carrying straight conductor placed in a uniform magnetic field which is perpendicular to it.
A flat coil ABCD is freely suspended between the pole of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
Name an instrument which makes use of the principle stated above.
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Write Fleming’s left hand rule.
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The direction of force on a current carrying conductor in a magnetic field is given by ____________.
A simple motor is made in a school laboratory. A coil of wire is mounted on an axle between the poles of a horseshoe magnet, as illustrated.
In the example above, coil ABCD is horizontal and the battery is connected as shown.
- For this position, state the direction of the force on the arm AB.
- Why does the current in the arm BC not contribute to the turning force on the coil?
Observe the given figure of Fleming's Left Hand Rule and write the labels of 'A' and 'B':
Two LED bulbs of 10W and 5W are connected in series. If the current flowing through 5W bulb is 0.005A, the current flowing through 10W bulb is ______.
