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The magnetic field at the centre of the current-carrying square loop shown in the figure is
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Important Questions on Magnetic Effect of Current
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A proton is revolving on a circular path of radius with frequency . Magnetic dipole moment associated with proton is
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An ammeter of resistance can measure currents upto . The value of shunt resistance to measure current upto is
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A current flows through a loop as shown in figure. The magnetic field at the Centre is
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The ratio of angular momentum to the atomic dipole moment for hydrogen like atoms and ions is
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A copper rod of mass slides under gravity on two smooth parallel rails distance apart and set an angle to the horizontal. At the bottom, the rails are joined by a resistance in figure. There is a uniform magnetic field perpendicular to the plane of the rails. The terminal velocity of rod is
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To increase the current sensitivity of a moving coil galvanometer by its resistance is increased, so that new resistance becomes twice its initial resistance, by what factor does its voltage sensitivity change?
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A positive charge is projected in magnetic field of width with velocity . Then, the time taken by charged particle to emerge from the magnetic field is
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A coil in the shape of an equilateral triangle of side is suspended between the pole pieces of a permanent magnet such that is in plane of the coil. If due to a current in the triangle, a torque rests on it, the side of the triangle is
