32 Year NEET Previous Year Questions: Moving Charges & Magnetism - 1 - NEET MCQ
25 Questions MCQ Test - 32 Year NEET Previous Year Questions: Moving Charges & Magnetism - 1
When a proton is accelerated through 1 V, thenits kinetic energy will be [1999]
If a long hollow copper pipe carries a current,then magnetic field is produced [1999]
Thus, the magnetic field is produced outside the pipe only.| 1 Crore+ students have signed up on EduRev. Have you? Download the App |
Two long parallel wires P and Q are both perpendicular to the plane of the paper with distance of 5 m between them. If P and Q carry currents of 2.5 amp and 5 amp respectively in the same direction, then the magnetic field at a point half-way between the wires is [2000]
is downward 
A proton moving with a velocity 3 × 105 m/senters a magnetic field of 0.3 tesla at an angle of30º with the field. The radius of curvature of itspath will be (e/m for proton = 108 C/kg) [2000]
= 0.5 x 10 -2m = 0.5cmIn a certain region of space electric field 
and magnetic field 
are perpendicular to each other and an electron enters in region perpendicular to the direction of and both and moves undeflected, then velocity of electron is [2001]
A charged particle of charge q and mass m enters perpendicularly in a magnetic field . Kinetic energy of the particle is E; then frequency of rotation is [2001]
A galvanometer can be converted into avoltmeter by connecting [2002]
A wire carries a current. Maintaining the samecurrent it is bent first to form a circular plane coil ofone turn which produces a magnetic field B at thecentre of the coil. The same length is now bentmore sharply to give a double loop of smaller radius.The magnetic field at the centre of the double loop,caused by the same current is [2002]
where
A particle having charge q moves with a velocity 
through a region in which both an electric field and a magnetic field are present .The force on the particle is [2002]
A charged particle moves through a magneticfield in a direction perpendicular to it. Then the [2003]
A long solenoid carrying a current produces amagnetic field B along its axis. If the current isdouble and the number of turns per cm is halved,the new value of the magnetic field is [2003]
A galvanometer acting as a voltmeter will have [2004]
A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 × 10–4 ampere gives adeflection of one per division. To convert thisgalvanometer into a voltmeter having a rangeof 25 volts, it should be connected with aresistance of [2004]
An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is proportional to [2005]
A very long straight wire carries a current I. At the instant when a charge + Q at point P has velocity , as shown, the force on the charge is
is along OY.When a charged particle moving with velocity is subjected to a magnetic field of induction the force on it is non-zero. This implies that
is either zero or 180º, then value of F will be zero as cross product of 
will be zero.Two circular coils 1 and 2 are made from the samewire but the radius of the 1st coil is twice that ofthe 2nd coil. What potential difference in voltsshould be applied across them so that themagnetic field at their centres is the same [2006]
If same potential is applied on them, current in Ist will be half that in the later. If V potential is applied on them, current in them
A beam of electron passes undeflected throughmutually perpendicular electric and magnetic fields.If the electric field is switched off, and the samemagnetic field is maintained, the electrons move [2007]
In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular path of radius R using a magnetic field B. If V and B are kept constant, the ratio 
will be proportional to
..........(i)
.......... (ii)
Under the influence of a uniform magnetic fielda charged particle is moving in a circle of radiusR with constant speed v. The time period of themotion [2007]
directed along z-axis, with a velocity 
making angles d with the z-axis. The time period of the motion is independent of R and v.
A closed loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments PS, SR, and RQ are F1 , F2 and F3 respectively and are in the plane of the paper and along the directions shown, the force on the segment QP is [2008]
A particle of mass m, charge Q and kinetic energyT enters a transverse uniform magnetic field ofinduction 
. After 3 seconds, the kinetic energyof the particle will be: [2008]
A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction 
in such a way that its axis makes an angle of 60° with . The magnetic flux linked with the disc is: [2008]
A galvanometer having a coil resistance of 60 Ωshows full scale deflection when a current of 1.0amp passes through it. It can be convertedinto an ammeter to read currents upto 5.0 amp by [2009]
A charged paritcle (charge q) is moving in a circleof radius R with uniform speed v. The associatedmagnetic moment μ is given by [2007]
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