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प्रश्न
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.
विकल्प
True
False
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उत्तर
This statement is true.
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संबंधित प्रश्न
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State Fleming’s left hand rule.
Name the rule for finding the direction of magnetic field produced by a straight current-carrying conductor.
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
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
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°
State condition when magnitude of force on a current carrying conductor placed in a magnetic field is maximum?
State two ways to increase the speed of rotation of a D.C. motor.
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When will the couple acting on the coil be
- maximum
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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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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?
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The graph (fig A) illustrates the correlation between the number of protons (x-axis) and the number of neutrons (y-axis) for elements A, B, C, D, and E in the periodic table. These elements are denoted by the letters rather than their conventional symbols. When the element C, depicted in the graph, undergoes radioactive decay, it releases radioactive rays. When these rays are directed into the plane of the paper in the presence of a magnetic field, as indicated in the fig B, they experience deflection, causing them to move upwards.
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Name the law used to identify the radioactive radiation emitted by the element.
