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General
Easy
Question
A conducting wire bent in the form of a parabola y2 = 2x carries a current i = 2 A as shown in figure. This wire is placed in a uniform magnetic field 
Tesla. The magnetic force on the wire is (in newton)
The correct answer is:
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A straight rod of mass m and length L is suspended from the identical spring as shown in the figure. The spring stretched by a distance of x0 due to the weight of the wire. The circuit has total resistance 
. When the magnetic field perpendicular to the plane of the paper is switched on, springs are observed to extend further by the same distance. The magnetic field strength is
A straight rod of mass m and length L is suspended from the identical spring as shown in the figure. The spring stretched by a distance of x0 due to the weight of the wire. The circuit has total resistance . When the magnetic field perpendicular to the plane of the paper is switched on, springs are observed to extend further by the same distance. The magnetic field strength is
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A particle moving with velocity v having specific charge (q/m) enters a region of magnetic field B having width at angle 53° to the boundary of magnetic field. Find the angle q in the diagram.
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The direction of magnetic force on the electron as shown in the diagram is along
The direction of magnetic force on the electron as shown in the diagram is along
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A particle with charge +Q and mass m enters a magnetic field of magnitude B, existing only to the right of the boundary YZ. The direction of the motion of the particle is perpendicular to the direction of B. Let 
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A particle of charge Q and mass M moves in a circular path of radius R in a uniform magnetic field of magnitude B. The same particle now moves with the same speed in a circular path of same radius R in the space between the cylindrical electrodes of the cylindrical capacitor. The radius of the inner electrode is R/2 while that of the outer electrode is 3R/2. Then the potential difference between the capacitor electrodes must be
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OABC is a current carrying square loop an electron is projected from the centre of loop along its diagonal AC as shown. Unit vector in the direction of initial acceleration will be
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A mass spectrometer is a device which select particle of equal mass. An iron with electric charge q > 0 and mass m starts at rest from a source S and is accelerated through a potential difference V. It passes through a hole into a region of constant magnetic field 
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A mass spectrometer is a device which select particle of equal mass. An iron with electric charge q > 0 and mass m starts at rest from a source S and is accelerated through a potential difference V. It passes through a hole into a region of constant magnetic field perpendicular to the plane of the paper as shown in the figure. The particle is deflected by the magnetic field and emerges through the bottom hole at a distance d from the top hole. The mass of the particle is
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A hollow cylinder having infinite length and carrying uniform current per unit length l along the circumference as shown. Magnetic field inside the cylinder is
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A long straight wire, carrying current I, is bent at its midpoint to from an angle of 45°. Induction of magnetic field at point P, distant R from point of bending is equal to :
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Two very long straight parallel wires, parallel to y-axis, carry currents 4I and I, along +y direction and –y direction, respectively. The wires are passes through the x-axis at the points (d, 0, 0) and (– d, 0, 0) respectively. The graph of magnetic field z-component as one moves along the x-axis from x = – d to x = +d, is best given by
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A long thin walled pipe of radius R carries a current I along its length. The current density is uniform over the circumference of the pipe. The magnetic field at the center of the pipe due to quarter portion of the pipe shown, is
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Find the magnetic field at P due to the arrangement shown
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Infinite number of straight wires each carrying current I are equally placed as shown in the figure. Adjacent wires have current in opposite direction. Net magnetic field at point P is
Infinite number of straight wires each carrying current I are equally placed as shown in the figure. Adjacent wires have current in opposite direction. Net magnetic field at point P is
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