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qUESTIONS

MCQs-PYQs-12th-jee

The magnitude of magnetic field required to accelerate protons (mass = 1.67×10−27kg) in a cyclotron that is operated at an oscillator frequency 12 MHz is approximately.

MCQs-PYQs-12th-jee

An electron, a proton, a deuteron and an alpha particle, each having the same speed are in a region of constant magnetic field perpendicular to the direction of the velocities of the particles. The radius of the circular orbits of these particles are respectively Re,Rp,Rd and Rα. It follows that

The resistance of a wire is 10Ω. Its length is increased by 10%by stretching. The new resistance will now be

MCQs-PYQs-12th-jee

Electron moves at right angles to a magnetic field of 1.5×10^−2 tesla with speed of 6×10^7m/s. If the specific charge of the electron is 1.7×10^11C/kg. The radius of circular path will be.

The resistance of a wire of uniform diameter d and length L is R. The resistance of another wire of the same material but diameter 2d and length 4L will be

MCQs-PYQs-12th-jee

Two ions having masses in the ratio 1:1 and charges 1:2 are projected into uniform magnetic field perpendicular to the field with speeds in the ratio 2:3.The ratio of the radius of circular paths along which the two particles move is

A wire of length 5m and radius 1 mm has a resistance of 1 ohm. What length of the wire of the same material at the same temperature and of radius 2 mm will also have a resistance of 1 ohm

MCQs-PYQs-12th-jee

A beam of ions with velocity 2×10^5 m/s enters normally into a uniform magnetic field of 4×10^−2 tesla. If the specific charge of the ion is 5×10^7 C/kg then the radius of the circular path described will be

MCQs-PYQs-12th-jee

A stream of charged particles enters into a region with crossed electric and magnetic fields as shown in the figure. On the other side is a screen with a hole that is right on the original path of the particles.

The density of copper is 9×10^3 kg/m^3 and its atomic mass is 63.5u. Each copper atom provides one free electron. Estimate the number of free electrons per cubic meter in copper

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