In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process forms the basis of an important diagnostic procedure called
|
(a) MRI |
(b) PET |
(c) CAT |
(d) SPECT |
(b) PET
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A straight wire carrying current i is turned into a circular loop. If the magnitude of magnetic moment associated with it in M.K.S. unit is M, the length of wire will be
|
(a) 4πiM |
(b) |
(c) |
(d) |
The respective radii of the two spheres of a spherical condenser are 12 cm and 9 cm. The dielectric constant of the medium between them is 6. The capacity of the condenser will be
|
(a) 240 pF |
(b) 240 μF |
(c) 240 F |
(d) None of the above |
The induction coil works on the principle of
|
(a) Self-induction |
(b) Mutual induction |
|
(c) Ampere's rule |
(d) Fleming's right hand rule |
Two identical conductors of copper and aluminium are placed in an identical electric fields. The magnitude of induced charge in the aluminium will be
|
(a) Zero |
(b) Greater than in copper |
|
(c) Equal to that in copper |
(d) Less than in copper |
The magnitude of the earth’s magnetic field at a place is 
and the angle of dip is δ. A horizontal conductor of length l lying along the magnetic north-south moves eastwards with a velocity v. The emf induced across the conductor is
|
(a) Zero |
(b) |
(c) |
(d) |
