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qUESTIONS

MCQs-PYQs-12th-jee

Uniform magnetic field B is directed vertically upwards and 3 wires of equal length L, carrying equal current I are lying in a horizontal plane such that the first one is along north, second one along north-east and the third one at 60∘ north of east. Force exerted by magnetic field B on them is

MCQs-PYQs-12th-jee

The magnetic field in a certain region of space is given by B=8.35×10^−2i T. A proton is shot into the field with velocity v=(2×10^5i + 4×10^5j)m/s. The proton follows a helical path in the field. The distance moved by proton in the x-direction during the period of one revolution in the yz-plane will be ( mass of proton=1.67×10^−27kg)

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

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.

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

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.

MCQs-PYQs-12th-jee

An electron enters the space between the plates of a charged parallel plate capacitor as shown in the figure. The charge density on the plate is σ. Electric intensity in the space between the plates is E. A uniform magnetic field B also exists in the space perpendicular to the direction of E. The electron moves perpendicular to both E and B without any change in direction. The time taken by the electron to travel a distance L in the space is

MCQs-PYQs-12th-jee

A homogeneous electric field E and a uniform magnetic field B are pointing in the same direction. A proton is projected with its velocity parallel to E. It will

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