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प्रश्न
For Fleming's left-hand rule, write down the three things that are 90° to each other, and next to each one write down the finger or thumb that represents it.
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उत्तर
In Fleming's left-hand rule, when thumb, forefinger and central finger are kept mutually perpendicular to each other:
(a) Thumb represents force.
(b) Forefinger represents magnetic field.
(c) Central finger represents current.
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संबंधित प्रश्न
Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer.)
What concealed do you get from the observation that a current-carrying wire deflects a compass needle placed near it?
State whether the following statement is true or false:
The magnetic field inside a long circular coil carrying current well be parallel straight lines.
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.
What is the shape of field lines inside a current-carrying solenoid? What does the pattern of field lines inside a current-carrying solenoid indicate?
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
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
A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in Figure below:
The force on the wire due to the magnet is directed:

fron N to S
from S to N
vertically downwards
vertically upwards
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:
a current is passed through coil B by plugging 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?
How will the direction of force be changed, if the current is reversed in the conductor placed in a magnetic field?
i) Which principle is explained in this figure?
ii) Which rule is used to find out the direction of a force in this principle?
iii) In which machine this principle is used? Draw a diagram showing working of that machine

State whether a magnetic field is associated or not around a static charge.
The north pole of Earth’s magnet is in the ____________.
A copper wire is held between the poles of a magnet

The current in the wire can be reversed. The pole of the magnet can also be changed over. In how many of the four directions shown can the force act on the wire?
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 ______.
If the strength of the current flowing through a wire is increased, the strength of the magnetic field produced by it ______.
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.

