The electric potential changes from 10 V to 30 V as one moves along x-axis from x = 0 to x = 2m . The magnitude of the electric field in the origin is
a) 10 V/m b) 20 V/m c) 5 V/m d) Both (a) and (b) Answer:a) 10 V/m Solution: E =... View Article
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A battery of emf 2 V and internal resistance 0.5 Ω is connected across a resistance of 9.5 Ω. How many electrons cross through a cross-section of the resistance in 1 second?
Answer: 1.25 x 1018 Solution: Req = 0.5 + 9.5 = 10 Ω The current in the circuit is i =... View Article
A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E and B represent the electric and magnetic fields respectively. Then, this region of space may have
a) E = 0, B = 0 b) E = 0, B ≠ 0 c) E ≠ 0, B = 0... View Article
A rod AB slides on a V-shaped wire with speed v as shown, such that at any time OA=OB=l. The magnetic field in the region is perpendicular downwards and has strength B, the induced emf in the rod is
a) zero b) Bvl c) √3Bvl/2 d) Bvl/2 Answer: b) Bvl Solution: Given, OA=OB=l Since OA and OB are equal ∠OBA and ∠OAB are also... View Article
A block of mass m is placed at rest on an inclined plane of inclination θ to the horizontal. If the coefficient of friction between the block and the plane is μ, then the total force exerted by the inclined plane on the block is:
a) mg b) μmgcosθ c) mg sinθ d) μmgtanθ Answer: a) mg Solution: The total force exerted by block =mg, The inclined plane... View Article
A boy weighing 25 kg climbs up from the first floor at a height 3 m above the ground to the third floor at a height 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g=10Nkg−1)
a) 1500 J b) 0 J c) 150 J d) 2250 J Answer: a) 1500 J Solution: P.E=mgh In the first... View Article
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CNA 28 Dec 2021:- Download PDF Here TABLE OF CONTENTS A. GS 1 Related B. GS 2 Related HEALTH 1.... View Article
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CNA 27 Dec 2021:- Download PDF Here TABLE OF CONTENTS A. GS 1 Related B. GS 2 Related POLITY 1.... View Article
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In the series Sansad TV Perspective, we bring you an analysis of the discussion featured on the insightful programme ‘Perspective’... View Article
