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What is the magnetic field at the centre of arc in the figure below? 

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Important Questions on Magnetic Effect of Current

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An electron revolves in a circular orbit of radius r with angular speed ω. The magnetic field at the centre of electron orbit is
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The magnetic field at the centre O of the current-carrying square loop shown in the figure is

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A proton is revolving on a circular path of radius 2 mm with frequency 10 Hz. Magnetic dipole moment associated with proton is
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An ammeter of resistance 1.5 Ω can measure currents upto 1 A. The value of shunt resistance to measure current upto 4 A is
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A current i flows through a loop as shown in figure. The magnetic field at the Centre O is
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The ratio of angular momentum L to the atomic dipole moment μi for hydrogen like atoms and ions is
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A copper rod of mass m slides under gravity on two smooth parallel rails l distance apart and set an angle θ to the horizontal. At the bottom, the rails are joined by a resistance R in figure. There is a uniform magnetic field B 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 50 %, its resistance is increased, so that new resistance becomes twice its initial resistance, by what factor does its voltage sensitivity change?