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प्रश्न
Differentiate between conductors and insulators.
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उत्तर
| Sr. No. | Conductors | Insulators |
| 1. | Those substances through which electricity can flow are called conductors. | Those substances through which electricity cannot flow are called insulators. |
| 2. | Electrical resistances of conductors are very low. | Electrical resistances of insulators are infinitely very high. |
| 3. | They contain a large number of free electrons. | They do not contain free electrons. |
| 4. | Generally, metals are conductors. E.g., silver, copper, aluminium. | Generally, non-metals are insulators. E.g., wood, rubber, plastic. |
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संबंधित प्रश्न
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.
State Fleming’s left-hand rule.
State whether the following statement is true or false
The field at the centre of a long circular coil carrying current will be parallel straight lines.
State Fleming’s left hand rule.
What is the shape of a current-carrying conductor whose magnetic field pattern resembles that of a bar magnet?
Fill in the following blank with suitable words:
For a current-carrying solenoid, the magnetic field is like that of a ...........
Name the type of magnet with which the magnetic field pattern of a current-carrying solenoid resembles.
What type of core should be put inside a current-carrying solenoid to make an electromagnet?
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 straight wire is held in exactly vertical position. If the current passes through this wire in the vertically upward direction, what is the direction of magnetic field produced by it? Name the rule used to find the direction of magnetic field.
What happens when a current-carrying conductor is placed in a magnetic field?
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.
The force experienced by a current-carrying conductor placed in a magnetic field is the largest when the angle between the conductor and the magnetic field is:
45°
60°
90°
180°
A horizontal wire carries a current as shown in Figure below between magnetic poles N and S:
Is the direction of the force on the wire due to the magnet:
(a) in the direction the current
(b) vertically downwards
(c) opposite to the current direction
(d) vertically upwards
If the current in a wire is flowing in the vertically downward direction and a magnetic field is applied from west to east, what is the direction of force in the wire?
Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. What would happen if:
the current is stopped by removing the plug from the key?
Explain your answer mentioning the name of the phenomenon involved.
State condition when magnitude of force on a current carrying conductor placed in a magnetic field is zero?
State condition when magnitude of force on a current carrying conductor placed in a magnetic field is maximum?
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?
A flat coil ABCD is freely suspended between the pole of U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
What happens when a current is passed in the coil?
State two ways to increase the speed of rotation of a D.C. motor.
State Fleming’s left-hand rule.
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?
State whether a magnetic field is associated or not around a static charge.
A current-carrying conductor is held in an exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:
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 ____________.
When current is parallel to a magnetic field, then force experience by the current-carrying conductor placed in a uniform magnetic field is ____________.
A magnetic field directed in north direction acts on an electron moving in east direction. The magnetic force on the electron will act ____________.
The diagram below shows a free conductor AB is kept in a magnetic field and is carrying current from A to B. (To avoid confusion complete path of the circuit is not shown) The direction of the force experienced by the conductor will be:
An alpha particle enters a uniform magnetic field as shown. The direction of force experienced by the alpha particle is ______.
If the strength of the current flowing through a wire is increased, the strength of the magnetic field produced by it ______.
