PYQSide ExamsMy practice

Moving Charges and Magnetism · Question 82

AIPMT 2003MCQEasy📈 Topic in 12% papers+4−1
1

A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

  1. speed of the particle remains unchanged
  2. direction of the particle remains unchanged
  3. acceleration remains unchanged
  4. velocity remains unchanged

Answer

(1) speed of the particle remains unchanged

Solution

Magnetic force: F = q( v B), always perpendicular to v

⇒ It does no work, so kinetic energy and speed stay constant.

⇒ It keeps changing the direction of motion (uniform circular motion), so velocity and the acceleration vector change continuously.

∴ Only the speed remains unchanged.

Answer: (1)

AIPMT 2003

Keep practising — Moving Charges and Magnetism

2

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is

  1. B/2
  2. B
  3. 2B
  4. 4B
AIPMT 2003
3

To convert a galvanometer into a voltmeter one should connect a

  1. high resistance in series with galvanometer
  2. low resistance in series with galvanometer
  3. high resistance in parallel with galvanometer
  4. low resistance in parallel with galvanometer.
AIPMT 2002
4

A charge q moves in a region where electric field and magnetic field both exist, then force on it is

  1. q ( v B )
  2. q E + q ( v B )
  3. q E + q ( B v )
  4. q B + q ( E v )
AIPMT 2002
5

The magnetic field of given length of wire for single turn coil at its centre is B then its value for two turns coil for the same wire is

  1. B/4
  2. B/2
  3. 4B
  4. 2B
AIPMT 2002
6

If number of turns, area and current through a coil is given by n, A and i respectively then its magnetic moment will be

  1. niA
  2. n2iA
  3. niA2
  4. ni A
AIPMT 2001
7

An electron having mass m and kinetic energy E enters a uniform magnetic field B perpendicularly, then its frequency will be

  1. eEqvB
  2. 2 meB
  3. eB2 m
  4. 2meBE
AIPMT 2001
8

In Thomson mass spectrograph, if E B, then the velocity of electron beam will be

  1. | E|| B|
  2. E B
  3. | B|| E|
  4. E2 B2
AIPMT 2001
9

The magnetic field at centre, P will be [figure]

  1. 04
  2. 0
  3. 02
  4. 4 0
AIPMT 2000

All Moving Charges and Magnetism PYQs →

PDFDownload Moving Charges and Magnetism PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Physics chapters
Class 11Units and MeasurementsMotion in a Straight LineMotion in a PlaneLaws of MotionWork, Energy and PowerSystem of Particles and Rotational MotionGravitationMechanical Properties of SolidsMechanical Properties of FluidsThermal Properties of MatterThermodynamics (Physics)Kinetic TheoryOscillationsWaves
Class 12Electric Charges and FieldsElectrostatic Potential and CapacitanceCurrent ElectricityMoving Charges and MagnetismMagnetism and MatterElectromagnetic InductionAlternating CurrentElectromagnetic WavesRay Optics and Optical InstrumentsWave OpticsDual Nature of Radiation and MatterAtomsNucleiSemiconductor ElectronicsExperimental Skills (Physics)