Best of Luck STUDENTS
Que1.
Two small conducting spheres of equal radius have charges 10μC & -20μC respectively placed at a distance R from each other. They experience force F1. If they are brought in contact and separated to the same distance, they experience force F2. Ratio of F1 to F2 is ___
a) 1:2
b) 1:1
c) 2:1
d) 8:1
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Que2.
Electric field intensity at a point in between two parallel sheets with like charges of same surface charge densities σ is ___
a) σ/εo
b) zero
c) σ/2εo
d) none of these
Que3.
There exists an electric field of 2 N/C along y direction. The flux passing through the square of side 1 m placed in xy plane inside the electric field is -
a) Zero
b) 2 Nm²/C
c) 1 Nm²/C
d) √3 Nm²/C
Que4.
A mass of 20g has a charge of 3mC. It moves with a velocity of 20m/s and enters a region of electric field of 80N/C in the same direction as the velocity of the mass. The velocity of the mass after 3 seconds in this region is -
a) 80 m/s
b) 56 m/s
c) 50 m/s
d) 36 m/s
Que5.
At what separation should two equal charges, 1 Coulomb each, be placed so that the force between them equals the weight of a 50 kg person?
Take, g = 10 m/s²
a) 2√2 km
b) 4√2 km
c) 3√2 km
d) None of these
Que6.
A water particle of mass 10 milligram and having a charge of 15 μC, stays suspended in a room. What is the magnitude of electric field in the room and what is its direction?
a) 10/3 V/m (upward)
b) 10 V/m (downward)
c) 20 V/m (downward)
d) 20/3 V/m (upward)
Que7.
Two insulating spheres are rubbed against each other and placed 1 cm apart. If they attract each other with a force of 0.1 N. How many electrons were transferred from one sphere to the other during rubbing?
a) 0.21 × 10¹²
b) 0.625 × 10¹⁹
c) 0.062 × 10¹⁴
d) 0.42 × 10¹²
Comment down your thoughts :-)
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ANSWERS
ANS 1. d)
ANS 2. a)
ANS 3. a)
ANS 4. b)
ANS 5. c)
ANS 6. d)
ANS 7. a)
by www.advguruji.blogspot.com
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