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qUESTIONS

MCQs-PYQs-12th-jee

Energy in a current carrying conductor is stored in the form of

An alpha particle (the nucleus of helium atom) (with charge +2e) is accelerated and moves in a vacuum tube with kinetic energy = 10.00 MeV. On applying a transverse a uniform magnetic field of 1.851 T, it follows a circular trajectory of radius 24.60 cm. Obtain the mass of the alpha particle. [charge of electron = 1.62 × 10-19 C]

Example 10.4 A circular coil of conducting wire has 500 turns and an area 1.26 × 10−4 m2 is enclosed by the coil. A current 100μA is passed through the coil. Calculate the magnetic moment of the coil.

Example 10.3 Consider a square loop of wire loaded with a glass bulb of mass m hanging vertically, suspended in air with its one part in a uniform magnetic field B with its direction coming out of the plane of the paper . Due to the current I flowing through the loop, there is a magnetic force in upward direction. Calculate the current I in the loop for which the magnetic force would be exactly balanced by the force on mass m due to gravity.

Example 10.5 A wire has 2 straight sections and one arc as shown in the figure. Determine the direction and magnitude of the magnetic field produced at the center O of the semicircle by the three sections individually and the total.

Example 10.7 A coaxial cable consists of a central conducting core wire of radius a and a coaxial cylindrical outer conductor of radius b. The two conductors carry an equal current I in opposite directions in and out of the plane of the paper. What will be the magnitude of the magnetic field B for a r b and b r ? What will be its direction?

Example 10.8 A solenoid of length 25 cm has inner radius of 1 cm and is made up of 250 turns of copper wire. For a current of 3A in it, what will be the magnitude of the magnetic field inside the solenoid?

A piece of straight wire has mass 20 g and length 1m. It is to be levitated using a current of 1 A flowing through it and a perpendicular magnetic field B in a horizontal direction. What must be the magnetic of B?

Calculate the value of magnetic field at a distance of 2 cm from a very long straight wire carrying a current 5 A

4) An electron is moving with a speed of 3 × 10 6 m/s in a magnetic field of 6.00 × 10-4 T perpendicular to its path. What will be the radius of the path? What will be frequency and the kinetic energy in keV ?

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