Question

1) Two resistors are connected to each other in parallel, one resistor has a known value of R, the resistance of the second one is unknown. If the equivalent of two resistors in parallel is equal to what is the resistance of the second one? A)R B) 2R E) 4R 2) Which one of the following sentences is correct about the velocity selector? A) The velocity of charged particles leaving a velocity selector are the same for all particles independent value of charge and value of mass. B) Velocity of a charged particle leaving a velocity selector is equal to v = B/E C) The velocity of a charge leaving the selector is independent of electric field. D) A velocity selector is made up of magnetic field and electric field which are parallel with respect to each other. E) The velocity of charge leaving the selector is independent of the magnetic field. 3) A charged particle is moving with velocity of V in a magnetic field of B, which one of the followings is correct: A) The direction of force F on the charge is parallel to magnetic field B B) The direction of force F on the charge is parallel to velocity direction V C) The force is maximized when velocity direction and magnetic field are parallel D) The force F is perpendicular (normal) to both velocity Vand magnetic field B E) The direction of force on positive charge or negative charge would be the same 4) A wire is carrying a current of land it is placed in a magnetic field of B, the force on the wire is zero if: A) The length of wire is infinite. B) If there is a non-zero angle between magnetic field B and current C) The direction of the current and magnetic field are perpendicular. D) The current and magnetic field are parallel. E) There is a 90 degree angle between current direction and magnetic field direction 5) The force between two parallel wires carrying electric current is repulsive when: A) The magnitude of the current of both wires are the same. B) The direction of current in wires are opposite C) One of the wires is carrying no current D) The direction of the currents in wires are the same. E) Wires carrying different current values.

Answer 1

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