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

2002 5 questions

1. Q1232002 · 27 Apr 2002 · Shift 1

   If in a circular coil $A$ of radius $R$, current $I$ is flowing and in another coil $B$ of radius $2R$ a current $2I$ is flowing, then the ratio of the magnetic fields $B_A$ and $B_B$, produced by them will be

   1. A.$1$
   2. B.$2$
   3. C.$1/2$
   4. D.$4$
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   Answer: A

2. Q1242002 · 27 Apr 2002 · Shift 1

   If an electron and a proton having same momentum enter perpendicular to a magnetic field, then

   1. A.curved path of electron and proton will be same (ignoring the sense of revolution)
   2. B.they will move undeflected
   3. C.curved path of electron is more curved than that of the proton
   4. D.path of proton is more curved.
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   Answer: A

3. Q1252002 · 27 Apr 2002 · Shift 1

   The time period of a charged particle undergoing a circular motion in a uniform magnetic field is independent of its

   1. A.speed
   2. B.mass
   3. C.charge
   4. D.magnetic induction
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   Answer: A

4. Q1262002 · 27 Apr 2002 · Shift 1
   
   1. A.$\frac{{\mu }_0}{2\pi r}{i}_1{i}_{2}dl\tan \theta$
   2. B.$\frac{{\mu }_0}{2\pi r}{i}_1{i}_{2}dl\sin \theta$
   3. C.$\frac{{\mu }_0}{2\pi r}{i}_1{i}_{2}dl\cos \theta$
   4. D.$\frac{{\mu }_0}{4\pi r}{i}_1{i}_{2}dl\sin \theta$
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   Answer: C

5. Q1452002 · 27 Apr 2002 · Shift 1

   At a specific instant emission of radioactive compound is deflected in a magnetic field. The compound can emit (i) electrons (ii) protons (iii) $\mathrm{H}{\mathrm{e}}^{2+}$ (iv) neutrons The emission at instant can be

   1. A.$i,ii,iii$
   2. B.$i,ii,iii,iv$
   3. C.$iv$
   4. D.$ii,iii$
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   Answer: A