Questions in Moving Charges and Magnetism

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	A straight wire carrying a current 10 A is bent into a semicircular arc of radius $5 cm$. The magnitude of magnetic field at the center is
	A long solenoid of length L has a mean diameter D. It has n layers of windings of N turns each. If it carries a current‘i’ the magnetic field at its centre will be
	A circular loop of radius 0.0157m carries a current of 2.0 amp. The magnetic field at the centre of the loop is $({\mu _0} = 4\pi \times {10^{ - 7}}\,weber/amp - m)$
	A long solenoid has 200 turns per cm and carries a current of 2.5 amps. The magnetic field at its centre is$({\mu _0} = 4\pi \times {10^{ - 7}}\,weber/amp{\rm{ - }}m)$
	Two concentric coplanar circular loops of radii ${r_1}$ and ${r_2}$ carry currents of respectively ${i_1}$ and ${i_2}$ in opposite directions (one clockwise and the other anticlockwise.) The magnetic induction at the centre of the loops is half that due to ${i_1}$ alone at the centre. If ${r_2} = 2{r_1}.$ the value of ${I_2}/{I_1}$ is
	PQRS is a square loop made of uniform conducting wire the current enters the loop at P and leaves at S. Then the magnetic field will be
	Magnetic fields at two points on the axis of a circular coil at a distance of $0.05 m$ and $0.2 m$ from the centre are in the ratio $8 : 1$. The radius of the coil is
	An electric current passes through a long straight wire. At a distance 5 cm from the wire, The magnetic field is B. The field at 20 cm from the wire would be
	A closely wound flat circular coil of 25 turns of wire has diameter of 10 cm and carries a current of 4 ampere. Determine the flux density at the centre of a coil
	The dimension of the magnetic field intensity B is

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