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

2006 3 questions

1. Q692006 · 29 Apr 2006 · Shift 1

   Needles $N_1,N_2$ and $N_3$ are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will

   1. A.attract $N_1$ and $N_2$ strongly but repel $N_3$
   2. B.attract $N_1$ strongly, $N_2$ weakly and repel $N_3$ weakly
   3. C.attract $N_1$ strongly, but repel $N_2$ and $N_3$ weakly
   4. D.attract all three of them
   Show answer

   Answer: B

2. Q702006 · 29 Apr 2006 · Shift 1

   In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. The path of the particle will be a

   1. A.helix
   2. B.straight line
   3. C.ellipse
   4. D.circle
   Show answer

   Answer: B

3. Q712006 · 29 Apr 2006 · Shift 1

   A long solenoid has 200 turns per $cm$ and carries a current $i$. The magnetic field at its center is $6.28\times 10^{-2}Weber/{\mathrm{m}}^2$. Another long solenoid has 100 turns per $cm$ and it carries a current $\frac{i}{3}$. The value of the magnetic field at its center is

   1. A.$1.05\times 10^{-2}Weber/{\mathrm{m}}^2$
   2. B.$1.05\times 10^{-5}Weber/{\mathrm{m}}^2$
   3. C.$1.05\times 10^{-3}Weber/{\mathrm{m}}^2$
   4. D.$1.05\times 10^{-4}Weber/{\mathrm{m}}^2$
   Show answer

   Answer: A