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1. Which of the following statements is/are True? Statement I- The earth behaves as a magnet with the magnetic field pointing exactly from the geographic south to the north Statement II- Magnetic monopoles do not exist. Statement III-  It is possible to make magnets out of iron and its alloys. a) I and II b) I, II and III c) II and III d) III only  Answer Answer : c 2. Which of the following statements is/are True? Statement I- The magnetic field lines escape to infinity Statement II- Magnetic field lines of a solenoid form continuous closed loops. Statement III-  The tangent to the field line at a given point represents the direction of the net magnetic field B at that point. a) I and II b) I, II and III c) II and III d) III only    Answer Answer : b 3. Magnetic moment of a solenoid at a far away axial point is ____________. Answer Answer : a 4. The magnetic potential energy of a magnetic dipole is  a) minimum at θ=180° b) maximum at...

1.       Which of the following statements is correct with respect to charges? a)       Moving charges produce both Electric and Magnetic field. b)      Static charges produce both Electric and Magnetic field. c)       Moving charges produce Electric field and not Magnetic field. d)      Moving charges produce Magnetic field and not Electric field   2.       The Force on a charge q moving with a velocity v in magnetic field B, is given by : a)       q( B x v ) b)      qBv cos θ c)       q( v x B ) d)      None of the above   3.       1 Tesla is equal to : a)       N-s/C-m b)      N-m/C-s c)       N-s/C d)    ...

  1.     Which of the following statements is wrong with respect to electrostatics? a)       Charge on any object is an integral multiple of an electronic charge b)      Charge is conserved c)       A stationary charge has both electric and magnetic field around it d)      There is an electric field around an isolated charge at rest.   2.     Two point charges in air at a distance of 20 cm from each other interact with a certain force. At what distance from each other should these charges be placed in oil of relative permittivity 5 to obtain same force of attraction. a)       8.94 X 10 -2 m b)      0.894 X 10 -2 m c)       89.4 X 10 -2 m d)      8.94 X 10 2 m     3.     Two free positive charges 4q and q are at a distance l apart. What charge Q ...