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A part of a long wire carrying a current i is bent into a circle of radius r as shown in figure. The net magnetic field at the centre O of the circular loop is
The correct answer is:
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In the circuit shown switch k2 is open and switch k1 is closed at t = 0. At time t = to switch k1 is opened and switch k2 is simultaneously closed. The variation of inductor current with time is
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An equilateral triangular loop having a resistance R and length of each side l is placed in a magnetic field which is varying at 
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A uniform but time varying magnetic field is present in a circular region of radius R The magnetic field is perpendicular and into the plane of the loop and the magnitude of the field is increasing at a constant rate 
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A large number of infinite long thin wires each carrying current i0 are kept along z-axis. Then the value of magnetic field ‘B’, at any point ‘P’ at a distance ‘x’ from O varies as
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Two fixed long conducting wires cross each other perpendicularly so that they do not actually touch but are close to each other as shown in the figure. Equal current i exist in each wire in the directions indicated. In what region(s) will there be some points with zero net magnetic field?
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A tube of uniform cross-section A is bent to form a circular arc of radius R, forming three quarters of a circle. A liquid of density 
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In the figure shown a particle of mass m moving with velocity 
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A tube of uniform cross-section A is bent to form a circular arc of radius R, forming three quarters of a circle. A liquid of density is forced through the tube with a linear speed v as shown in figure. The net force exerted by the liquid on the tube is
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