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प्रश्न
Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.
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उत्तर
Electric motor is a device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.
APPEARS IN
संबंधित प्रश्न
State Fleming’s left hand rule.
State the form of magnetic field lines around a straight current-carrying conductor.
State whether the following statement is true or false:
The magnetic field inside a long circular coil carrying current well be parallel straight lines.
Name and state the rule to determine the direction of magnetic field around a straight current-carrying conductor.
What is a solenoid? Draw a sketch to show the magnetic field pattern produced by a current-carrying solenoid.
The magnetic field associated with a current-carrying straight conductor is in anticlockwise direction. If the conductor was held along the east-west direction, what will be the direction of current through it? Name and state the rule applied to determine the direction of current?
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
State the unit of magnetic field in terms of the force experienced by a current carrying conductor placed in a magnetic field
State two ways to increase the speed of rotation of a D.C. motor.
A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
When will the couple acting on the coil be
- maximum
- minimum?
Differentiate between conductors and insulators.
Write Fleming’s left hand rule.
A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in the figure below:
The force on the wire due to the magnet is directed ____________.
A magnetic field directed in north direction acts on an electron moving in east direction. The magnetic force on the electron will act ____________.
Describe the activity that shows that a current-carrying conductor experiences a force perpendicular to its length and the external magnetic field. How does Fleming’s left-hand rule help us to find the direction of the force acting on the current carrying conductor?
What do you know about Michael Faraday?
A copper conductor is placed over two stretched copper wires whose ends ate connected to a D.C. supply as shown in the diagram.
- What should be the magnetic poles at the points A and B lying on either side of the conductor to experience the force in the upward direction?
- Name the law used to find these polarities.
