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Free Online Mock Physics Multiple Choice Test on Electricity effects
Sub Category : Electricity effects Test : 8 Time Left :
1) An electron of mass = 9 Ã- 1031 kg, charge = 1.6 Ã- 10 power-19 C and kinetic energy = 7.2 Ã- 10 power-18 J is moving in a circular orb J is moving in a circular orbit in a magnetic field of 9 Ã- 10 power-5 web/m2. The radius of the orbit is (1) 1.25 cm (2) 2.5 cm (3) 12.5 cm (4) 25.0 cm
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2) Which of the following particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field?(1) Li power+ (2) Electron (3) Proton (4) He power+
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3)Two long straight wires carry currents in opposite directions. magnetic force between them will be
(1) Attractive (2) Repulsive (3) Both (1) and (2) (4) None of these
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4) Two long straight wires are set parallel to each other. Each carries i in the same direction. Separation between them is 2r. The intensity of magnetic field midway between them is (1) MU0 i/r (2) 4MU0 i/r (3) Zero (4) MU0 i/4r
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5) A long solenoid has n turns per metre. A current of I is flowing through it. The magnetic field at the ends of solenoid is (1)MU0/Ni/2 (2) MU0 Ni (3) Zero (4) 2 MU0 Ni
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