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qUESTIONS

MCQs-PYQs-12th-jee

A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current I passes through the coil, the magnetic field at the centre is

MCQs-PYQs-12th-jee

A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction

MCQs-PYQs-12th-jee

Two identical wires A and B, each of length “l”, carry the same current I. Wire A is bent into a circle of radius R and wire B is bent to form a square of side ′a′. If BA and BB are the values of magnetic field at the centres of the circle and square respectively, then the ratio BA/BB is

MCQs-PYQs-12th-jee

A symmetric star shaped conducting wire loop is carrying a steady state current I as shown in the figure. The distance between the diametrically opposite vertices of the star is 4a. The magnitude of the magnetic field at the center of the loop is

MCQs-PYQs-12th-jee

Wires 1 and 2 carrying currents i1 and i2 respectively are inclined at an angle θ to each other. What is the force on a small element dl of wire 2 at a distance r from wire 1 (as shown in figure) due to the magnetic field of wire 1 ?

MCQs-PYQs-12th-jee

A current loop consists of two identical semicircular parts each of radius R, one lying in the .x-y plane and the other in x-z plane. If the current in the loop is i. The resultant magnetic field due to the two semicircular parts at their common centre is

MCQs-PYQs-12th-jee

A wire carrying current `I` has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X-axis while semicicular portion of radius `R` is lying in `Y-Z` plane. Magnetic field at point `O` is

MCQs-PYQs-12th-jee

Two similar coils of radius R are lying concentrically with their planes at right angles to each other. the currents flowing in them are l and 2l, respectively. The resultant magnetic field in induction at the centre will be

MCQs-PYQs-12th-jee

Three coplanar, parallel, long straight wires are equally spaced, that is, the distance between each pair of successive wires is the same. the first and the third wire carry currents of 1 a each, in the same direction. what must be the current in the second wire (wire in the middle), so that the other two wires do not feel any net force?

MCQs-PYQs-12th-jee

Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are 3 : 4 : 5. What is the ratio of distances of middle wire from the others if the net force experienced by it is zero

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