Advertisements
Advertisements
प्रश्न
Magnetic lines of force always cross each other
उत्तर
False
Magnetic lines of force never cross each other. If they cross the magnetic lines of force will show the two directions
APPEARS IN
संबंधित प्रश्न
A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?
A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 20 cm from the wire?
A horizontal overhead power line carries a current of 90 A in east to west direction. What is the magnitude and direction of the magnetic field due to the current 1.5 m below the line?
The net charge in a current-carrying wire is zero. Then, why does a magnetic field exert a force on it?
A straight horizontal wire of mass 10 mg and length 1.0 m carries a current of 2.0 A. What minimum magnetic field B should be applied in the region, so that the magnetic force on the wire may balance its weight?
Each of the batteries shown in figure has an emf equal to 5 V. Show that the magnetic field B at the point P is zero for any set of values of the resistances.
What is Lorentz force?
Explain "Magnetic force never does any work on moving charges".
A charged particle enters an environment of a strong and non-uniform magnetic field varying from point to point both in magnitude and direction, and comes out of it following a complicated trajectory. Would its final speed equal the initial speed if it suffered no collisions with the environment?
Direction of magnetic force on a positive charge moving in a magnetic field is given by ______.
What is the magnetic induction of the field at the point O in a current I carrying wire that has the shape shown in the figure? The radius of the curved part of the wire is R, the linear parts are assumed to be very long.
In the product `vec"F" = "q" (vec"υ" xx vec"B")`
= `"q" vec"υ" xx ("B"hat"i" +"B"hat"j" + "B"_0hat"k")`
For q = 1 and `vec"υ" = 2hat"i" + 4hat"j" + 6hat"k"` and
`vec"F" = 4hat"i" - 20hat"j" + 12hat"k"`
What will be the complete expression for `vec"B"`?
Consider a wire carrying a steady current, I placed in a uniform magnetic field B perpendicular to its length. Consider the charges inside the wire. It is known that magnetic forces do no work. This implies that ______.
- motion of charges inside the conductor is unaffected by B since they do not absorb energy.
- some charges inside the wire move to the surface as a result of B.
- if the wire moves under the influence of B, no work is done by the force.
- if the wire moves under the influence of B, no work is done by the magnetic force on the ions, assumed fixed within the wire.
A charged particle would continue to move with a constant velocity in a region wherein ______.
- E = 0, B ≠ 0.
- E ≠ 0, B ≠ 0.
- E ≠ 0, B = 0.
- E = 0, B = 0.
The unit Wbm-2 is equal to ______.
State the expression for the Lorentz force on a charge due to an electric field as well as a magnetic field. Hence discuss the magnetic force on a charged particle which is (i) moving parallel to the magnetic field and (ii) stationary.
What is the relation between Tesla and Gauss?
