Questions in Moving Charges and Magnetism

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“On flowing current in a conducting wire the magnetic field produces around it.” It is a law of
The magnetic field near a current carrying conductor is given by
A current of 10A is passing through a long wire which has semicircular loop of the radius 20cm as shown in the figure. Magnetic field produced at the centre of the loop is Question Image
A wire in the form of a circular loop of one turn carrying a current produces a magnetic field B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is
A long straight wire carrying current of 30A is placed in an external uniform magnetic field of induction $4 \times 10^{–4}T$. The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction in tesla at a point 2.0 cm away from the wire is
The earth’s magnetic field at a given point is $0.5 \times {10^{ - 5}}Wb{\rm{ - }}{m^{ - 2}}$. This field is to be annulled by magnetic induction at the center of a circular conducting loop of radius 5.0cm. The current required to be flown in the loop is nearly
A coil having N turns carry a current I as shown in the figure. The magnetic field intensity at point P is Question Image
Two similar coils are kept mutually perpendicular such that their centres coincide. At the centre, find the ratio of the magnetic field due to one coil and the resultant magnetic field by both coils, if the same current is flown
In the figure, what is the magnetic field at the point O Question Image

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