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qUESTIONS

MCQs-PYQs-12th-jee

A magnetic field can be produced by

MCQs-PYQs-12th-jee

A steady current I goes through a wire loop PQR having shape of a right angle triangle with PQ = 3x, PR = 4x and QR = 5x. if the magnitude of the magnetic field at P due to this loop is k (μ0I/48πx) , find the value of k.

MCQs-PYQs-12th-jee

A thin flexible wire of length L is connected to two adjacent fixed points and carries a current I in the clockwise direction as shown in figure. When the system is put in a uniform magnetic field of strength B, going into plane of paper, the tension developed in the wire will be:

MCQs-PYQs-12th-jee

A horizontal overhead powerline is at a height of 4m from the ground and carries a current of 100A from east to west. The magnetic field directly below it on the ground is

MCQs-PYQs-12th-jee

Two straight long conductors AOB and COD are perpendicular to each other and carries currents i1 and i2 respectively. The magnitude of magnetic induction at a point P at a distance a from the point O in a direction perpendicular to the plane ACBD is

MCQs-PYQs-12th-jee

An infinitely long conductor PQR is bent to form a right angle as shown. A current I flows through PQR. The magnetic field due to this current carrying conductor at the point M is H1.Now another infinitely long straight conductor QS is connected at Q so that current is I/2 in as well as in QS, the current in PA remaining unchanged. The magnetic field at M is now H2.The ratio H1/H2 is?

MCQs-PYQs-12th-jee

A long straight wire along the z-axis carries a current I in the negative z direction. The magnetic vector field B at a point having coordinates (x, y) in the z = 0 plane is

MCQs-PYQs-12th-jee

A conductor lies along the z-axis at -1.5 less than z less than 1.5m and carries a fixed current cf 10.0A in -az. direction (see figure). For a field B=3.0x 10-4 e-0.2xay T, find the power required to move the conductor at constant speed to x =2.0 m, y =-0 in 5x 10-3 s. Assume parallel motion along the x-axis.

MCQs-PYQs-12th-jee

The magnetic field due to a current carrying circular loop of radius 3cm at a point on the axis at a distance of 4cm from the centre is 54μT. What will be its value at the centre of the loop?

MCQs-PYQs-12th-jee

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circle loop of n turns. The magnetic field at the centre of the coil will be?

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