Magnetic Field Due to a Circular Ring on the Axis
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Q. A direct current is passing through a wire. It is bent to form a coil of one turn. Now, it is further bent into a coil of 4 turns but of smaller radius. The ratio of magnetic induction at the centre of this to the magnetic induction at the centre of coil of one turn is
Q.
A charge q coulomb moves in a circle at n revolutions per second and the radius of the circle is r metre. Then magnetic field at the centre of the circle is
- 2πqnr×10−7 Newton/(ampere−metre)
2πqr×10−7 Newton/(ampere−metre)
2πqr×10−7 Newton/(ampere−metre)
2πnqr×10−7 Newton/(ampere−metre)