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A wire of length L carrying a current I is bent into a circle. The magnitude of the magnetic field at the centre of the circle is

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Important Questions on Magnetic Effect of Electric Current

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If the current flowing in ABCD is I. Then the field at P as shown in the figure will be

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A coil of radius 200 mm is to produce a field of 0.4 G in its centre with a current of 0.25 A. How many turns must be there in the coil?

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A current I ampere flows in a circular arc of wire whose radius is r, which subtends an angle 3π2 radian at its centre. The magnetic induction B at the centre isQuestion Image

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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.

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A and B  are two concentric circular conductors of centre O and carrying currents I1 and I2 as shown in the figure. If ratio of their radii is 1:2 and ratio of the flux densities at O due to A and B is 1:3 then the value of I1I2 is

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Two identical coils carrying equal current have a common centre and their planes are at right angles to each other. What is the ratio of magnitudes of the resultant magnetic field and the field due to one coil along its axis?

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The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a semi-circular coil made from the same length of wire will be

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Two infinite length wires carry currents $8 \mathrm{A}$ and 6 A and are placed along $X$ -axis and Y-axis respectively. Magnetic field at a point $\mathrm{P}(0,0, \mathrm{d}) \mathrm{m}$ will be