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Physics Test 127

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Physics Test 127
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Weekly Quiz Competition
  • Question 1
    4 / -1

    An electron moving with kinetic energy  6.6 x 10 -14J enters a magnetic field 4 x 10 -3 T at right angle to it. The radius of its circular path will be nearest to

  • Question 2
    4 / -1

    A closely wound flat circular coil of 25 turns of wire has diameter of 10 cm which carries current of 4 A, the flux density at the centre of a coil will be

  • Question 3
    4 / -1

    An electron is travelling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be

  • Question 4
    4 / -1

    The magnetic Resonance Imaging (MRI) is based on the phenomenon of

  • Question 5
    4 / -1

    A circular coil of radius R carries an electric current. The magnetic field due to the coil a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as

    Solution

    When r >> R Magnetic field at a point on the axis of a loop is given by B = (mu /2 * pi) (AI/ r³)Hence B is proportional to 1/r³ Hence Correct option is D.

     

  • Question 6
    4 / -1

    A cyclotron is operating at a frequency of 12 x 106 Hz. Mass of deuteron is 3.3 x 10 -27 kg and charge on deuteron is  1.6 x 10 -19 induction of the necessary magnetic field is

  • Question 7
    4 / -1

    The strength of the transverse magnetic field required to bend photoelectrons of maximum kinetic energy with in a circle of radius 50 cm when light of wavelength 4000Å is incident on barium emitter is (work function of barium is 2.5 eV)

  • Question 8
    4 / -1

    Two equal electric currents are flowing in wires perpendicular to each other as shown in figure. AB and CD are lines perpendicular to each other and symmetrically placed with respect to currents. Then the resultant magnetic field will be zero on

    Solution

    Applying right hand grip rule and considering AB, the direction of magnetic field due to one current is upwards and that due to other is downwards. Both the magnetic fields cancel out each other, and the resultant magnetic field is zero. Considering CD and applying right hand grip rule for the two currents, the direction of magnetic field is in the same direction in both the cases giving non-zero resultant 

     

  • Question 9
    4 / -1

    A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The strength of magnetic field far away is

  • Question 10
    4 / -1

    The semicircular portion (radius R) of a wire carrying current i is placed in a uniform magnetic field B. The magnetic field is perpendicular to the plane of the circle. The magnetic of the force on the wire is

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