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Moving Charges and Magnetism · Question 57

AIPMT 2010 (Mains)MCQMedium📈 Topic in 12% papers+4−1
1

A particle having a mass of 10-2 kg carries a charge of 5 10-8 C. The particle is given an initial horizontal velocity of 105 m s-1 in the presence of electric field E and magnetic field B. To keep the particle moving in a horizontal direction, it is necessary that Which one of the following pairs of statements is possible ?

  1. A and C only
  2. C and D only
  3. B and C only
  4. B and D only

Answer

(3) B and C only

Solution

Force on the particle: F = q E + q( v B) (weight neglected).

B: B v v B = 0; E v force only along the velocity. The particle keeps moving in the same horizontal direction — possible.

C: E B v (crossed fields): the electric and magnetic forces are along the same line and can cancel when qE = qvB (velocity selector) — possible.

A: q( v B) is perpendicular to v and is not balanced by q E (along v) the path bends — not possible.

D: no magnetic force, but q E perpendicular to v deflects the particle — not possible.

B and C are possible.

Answer: (3)

AIPMT 2010 (Mains)

Keep practising — Moving Charges and Magnetism

2

Two identical bar magnets are fixed with their centers at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure [figure] The force on the charge Q is

  1. zero
  2. directed along OP
  3. directed along PO
  4. directed perpendicular to the plane of paper
AIPMT 2010 (Mains)
3

Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the center of the ring is

  1. 0 q f2 R
  2. 0 q f2R
  3. 0 q2fR
  4. 0 q2 f R
AIPMT 2010 (Prelims)
4

A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be

  1. 900
  2. 1800
  3. 500
  4. 1000
AIPMT 2010 (Prelims)
5

A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be

  1. 900
  2. 1800
  3. 500
  4. 1000
AIPMT 2010 (Prelims)
6

A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is F, the net force on the remaining three arms of the loop is

  1. 3 F
  2. - F
  3. -3 F
  4. F
AIPMT 2010 (Prelims)
7

A beam of cathode rays is subjected to crossed electric (E) and magnetic fields (B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (Where V is the potential difference between cathode and anode)

  1. B22VE2
  2. 2VB2E2
  3. 2VE2B2
  4. E22VB2
AIPMT 2010 (Prelims)
8

A galvanometer having a coil resistance of 60 shows full scale deflection when a current of 1.0 amp passes through it. It can be converted into an ammeter to read currents up to 5.0 amp by

  1. putting in series a resistance of 15
  2. putting in series a resistance of 240
  3. putting in parallel a resistance of 15
  4. putting in parallel a resistance of 240
AIPMT 2009
9

The magnetic force acting on a charged particle of charge -2 C in a magnetic field of 2 T acting in y direction, when the particle velocity is (2 i + 3 j) 106 m s-1, is

  1. 4 N in z direction
  2. 8 N in y direction
  3. 8 N in z direction
  4. 8 N in -z direction
AIPMT 2009
10

Under the influence of a uniform magnetic field, a charged particle moves with constant speed v in a circle of radius R. The time period of rotation of the particle

  1. depends on R and not on v
  2. is independent of both v and R
  3. depends on both v and R
  4. depends on v and not on R
AIPMT 2009
11

A particle of mass m, charge Q and kinetic energy T enters a transverse uniform magnetic field of induction B. After 3 seconds the kinetic energy of the particle will be

  1. T
  2. 4 T
  3. 3 T
  4. 2 T
AIPMT 2008

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