Physics Sample Test Paper 5 - AIEEE - 2009

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(SOLVED)
Note : All Answers are in red.

1. Two particles A and B of masses m_A and m_B respectively and having the same charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are v_A and v_B respectively and the trajectories are as shown in the figure. Then

m_Av_A < m_Bv_B
m_Av_A > m_Bv_B
m_A < m_B and v_A < v_B
m_A = m_B and v_A = v_B

2. M₁ & M₂ are two concave mirrors of the same focal length 10 cm. AB & CD are their principal axes respectively. A point object O is kept on the line AB at distance 15 cm from M₁. The distance between the mirrors 20 cm. Considering two successive reflections first on M₁ and then on M₂. The distance of final image from the line AB is:

3 cm
1.5 cm
4.5 cm
1 cm

3. A particle of charge q and mass m moves in a circular orbit of radius r with angular speed Ω. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on
Ω and q
Ω, q and m
q and m
Ω and m

4. Two long parallel wires are at a distance 2d apart. They carry steady equal currents flowing out of the plane of the paper, as shown. The variation of the magnetic field B along the XX' is given by

s

- Ans

5. An infinitely long conductor PQR is bent to form a right angle as shown. A current I flows through PQR. The magnetic field due to this current at the point M is H₁. Now, another infinitely long straight conductor QS is connected at Q so that the current in PQ remaining unchanged. The magnetic field at M is now H₂. The ratio H₁/H₂ is given by

1/2
1
2/3
2

6. An ionized gas contains both positive and negative ions. If it is subjected simultaneously to an electric field along the +x direction and a magnetic field along the +z direction, then

positive ions deflect towards +y direction and negative ions towards -y direction
all ions deflect towards +y direction
all ions deflect towards -y direction
positive ions deflect towards -y direction and negative ions towards +y direction.

7. A bar magnet of magnetic moment M is rotated about its center through 360� in a uniform magnetic field B. The work done in the process is
2 π MB
2 MB
1 MB
Zero

8. A homogeneous electric field and a uniform magnetic field are pointing in the same direction. A proton is projected with its velocity parallel to. It will :
Go on moving in the same direction with increasing velocity
Go on moving in the same direction with constant velocity
Turn to its right
Turn to its left

9. A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E and B represent the electric field and magnetic fields respectively, this region of space may don't have
E = 0, B = 0
E = 0, B 0
E0, B = 0
E0, B0

10. A non-planer loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P(a, 0, a) points in the direction.

- Ans