Advertisements
Advertisements
प्रश्न
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?
Advertisements
उत्तर
- downwards
- Because BC is in the same direction as the direction of field lines. Force is minimum when the direction of current in the conductor is the same as that of the magnetic field. BC will not contribute as the force on this part of the coil will be cancelled by the force on DA.
APPEARS IN
संबंधित प्रश्न
The magnetic field in a given region is uniform. Draw a diagram to represent it.
The magnetic field inside a long straight solenoid-carrying current ______.
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.
What is the shape of a current-carrying conductor whose magnetic field pattern resembles that of a bar magnet?
State and explain the Clock face rule for determining the polarities of a circular wire carrying current.
The diagram given below represents magnetic field caused by a current-carrying conductor which is:
(a) a long straight wire
(b) a circular coil
(c) a solenoid
(d) a short straight wire
What happens when a current-carrying conductor is placed in a magnetic field?
In a statement of Fleming's left-hand rule, what do the following represent?
(a) direction of centre finger.
(b) direction of forefinger.
(c) direction of thumb.
Name and state the law which is used to determine the direction of force on a current carrying conductor placed in a magnetic field.
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.
When will coil come to rest?
