IIT-JEE Exam

An electron and a proton are moving on straight parallel paths with same velocity. They enter a semiinfinite
region of uniform magnetic field perpendicular to the velocity. Which of the following
statement(s) is / are true?
(A) They will never come out of the magnetic field region.
(B) They will come out travelling along parallel paths.
(C) They will come out at the same time.
(D) They will come out at different times.

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IIT-JEE Other Question

A composite block is made of slabs A, B, C, D and E of
different thermal conductivities (given in terms of a
constant K) and sizes (given in terms of length, L) as
shown in the figure. All slabs are of same width. Heat
‘Q’ flows only from left to right through the blocks. Then
in steady state
(A) heat flow through A and E slabs are same.
(B) heat flow through slab E is maximum.
(C) temperature difference across slab E is smallest.
(D) heat flow through C = heat flow through B + heat flow through D. boy is pushing a ring of mass 2 kg and radius 0.5 m with a stick..The stick applies a force of 2N on the ring and rolls it
without slipping with an acceleration of 0.3 m/s2. The coefficient of
friction between the ground and the ring is large enough that rolling
always occurs and the coefficeint of friction between the stick and the ring
is (P/10). The value of P is