When the current i is flowing through a conductor, the drift velocity is v. If 2i current is flowed through the same metal but having double the area of cross-section, then the drift velocity will be
|
(a) v/4 |
(b) v/2 |
(c) v |
(d) 4v |
(c) v
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A proton, a deutron and an a-particle having the same momentum, enters a region of uniform electric field between the parallel plates of a capacitor. The electric field is perpendicular to the initial path of the particles. Then the ratio of deflections suffered by them is
|
(a) 1 : 2 : 8 |
(b) 1 : 2 : 4 |
(c) 1 : 1 : 2 |
(d) None of these |
Consider the following two statements
A. Energy spectrum of a-particles emitted in radioactive decay is discrete
B. Energy spectrum of b-particles emitted in radioactive decay is continuous
|
(a) Only A is correct |
(b) Only B is correct |
|
(c) A is correct but B is wrong |
(d) Both A and B are correct |
A long copper tube of inner radius R carries a current i. The magnetic field B inside the tube is
|
(a) |
(b) |
(c) |
(d) Zero |
Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is
|
(a) F / 8 |
(b) F / 4 |
(c) 4 F |
(d) F / 16 |
A and B are two concentric circular conductors of centre O and carrying currents 
and 
as shown in the adjacent figure. If ratio of their radii is 1 : 2 and ratio of the flux densities at O due to A and B is 1 : 3, then the value of 
is
|
(a) |
(b) |
(c) |
(d) |
In an adjoining figure are shown three capacitors 
and 
joined to a battery. The correct condition will be (Symbols have their usual meanings)
|
(a) |
(b) |
|
(c) |
(d) |
In electrolysis, if the duration of the passage of current is doubled, the mass liberated i
|
(a) Doubled |
(b) Halved |
(c) Increased four times |
(d) Remains the same |
