1
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
Two identical charged spheres suspended from a common point by two massless strings of lengths $$l$$, are initially at a distance d(d < < $$l$$) apart because of their mutual repulsion. The charges begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity v. Then v varies as a function of the distance x between the spheres, as
A
v $$ \propto $$ x$$-$$1/2
B
v $$ \propto $$ x$$-$$1
C
v $$ \propto $$ x1/2
D
v $$ \propto $$ x
2
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of emf's is
A
3 : 4
B
3 : 2
C
5 : 1
D
5 : 4
3
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
The charge flowing through a resistance R varies with time t is Q = at $$-$$ bt2, where $$a$$ and $$b$$ are positive constants. The total heat produced in R is
A
$${{{a^3}R} \over {2b}}$$
B
$${{{a^3}R} \over {b}}$$
C
$${{{a^3}R} \over {6b}}$$
D
$${{{a^3}R} \over {3b}}$$
4
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
A long straight wire of radius $$a$$ carries a steady current $$I$$. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B', at radial distance $${a \over 2}$$ and 2$$a$$ respectively, from the axis of the wire is
A
1
B
4
C
$${1 \over 4}$$
D
$${1 \over 2}$$
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