Magnetic Effects of Current & Magnetism · JEE Main previous year questions

2005 3 questions

1. Q1242005 · 28 Apr 2005 · Shift 1

   A charged particle of mass $m$ and charge $q$ travels on a circular path of radius $r$ that is perpendicular to a magnetic field $B$. The time taken by the particle to complete one revolution is

   1. A.$\frac{2\pi q^{2}B}{m}$
   2. B.$\frac{2\pi mq}{B}$
   3. C.$\frac{2\pi m}{qB}$
   4. D.$\frac{2\pi qB}{m}$
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   Answer: C

2. Q1252005 · 28 Apr 2005 · Shift 1

   A magnetic needle is kept in a non-uniform magnetic field. It experiences :

   1. A.neither a force nor a torque
   2. B.a torque but not a force
   3. C.a force but not a torque
   4. D.a force and a torque
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   Answer: D

3. Q1372005 · 28 Apr 2005 · Shift 1
   
   1. A.$-Blv$
   2. B.$Blv$
   3. C.$2Blv$
   4. D.$\mathrm{zero}$
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   Answer: C