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General
Easy
Question
In the figure shown a coil of single turn is wound on a sphere of radius R and mass m. The plane of the coil is parallel to the plane and lies in the equatorial plane of the sphere. Current in the coil is i. The value of B if the sphere is in equilibrium is
The correct answer is:
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A conducting ring of mass 2 kg and radius 0.5 m is placed on a smooth horizontal plane. The ring carries a current i = 4A. A horizontal magnetic field B = 10T is switched on at time t = 0 as shown in figure. The initial angular acceleration of the ring will be
A conducting ring of mass 2 kg and radius 0.5 m is placed on a smooth horizontal plane. The ring carries a current i = 4A. A horizontal magnetic field B = 10T is switched on at time t = 0 as shown in figure. The initial angular acceleration of the ring will be
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A circular current loop of radius a is placed in a radial field B as shown. The net force acting on the loop 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 RW. 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 RW. 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 charged particle enters a uniform magnetic field perpendicular to its initial direction travelling in air. The path of the particle is seen to follow the path in figure. Which of statements 1–3 is/are correct? [1] The magnetic field strength may have been increased while the particle was travelling in air [2] The particle lost energy by ionising the air [3] The particle lost charge by ionising the air
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A particle moving with velocity v having specific charge (q/m) enters a region of magnetic field B having width 
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A particle having charge q enters a region of uniform magnetic field 
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The direction of magnetic force on the electron as shown in the diagram is along
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Two waves of lengths 50 cm and 51 cm produced 12 beats per second The velocity of sound is
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