Physics-
General
Easy
Question
A cylindrical solid of length L and radius a is having varying resistivity given by r = r0 x where r0 is a positive constant and x is measured from left end of solid. The cell shown in the figure is having emf V and negligible internal resistance. The electric field as a function of x is best described by :

- None of these
The correct answer is: 
Consider an elemental part of solid at a distance x from left end of width dx. Resistance of this elemental part is

Related Questions to study
physics-
A charged oil drop falls with terminal velocity V0 in the absence of electric field An electric field E keeps it stationary The drop acquires additional charge q and starts moving upwards with velocity V0 The initial charge on the drop was
A charged oil drop falls with terminal velocity V0 in the absence of electric field An electric field E keeps it stationary The drop acquires additional charge q and starts moving upwards with velocity V0 The initial charge on the drop was
physics-General
maths-
if
find the value of x in given figure.

if
find the value of x in given figure.

maths-General
maths-
The number of positive integral solutions of the inequation
is –
The number of positive integral solutions of the inequation
is –
maths-General
maths-
Set of values of x satisfying the inequality
is
then 2a + b + c is equal to
Set of values of x satisfying the inequality
is
then 2a + b + c is equal to
maths-General
maths-
Number of integral values of x for which the inequality log10 
0 holds true, is
Number of integral values of x for which the inequality log10 
0 holds true, is
maths-General
maths-
implies
implies
maths-General
maths-
log4 (2x2 + x + 1) – log2 (2x – 1)
– tan 
log4 (2x2 + x + 1) – log2 (2x – 1)
– tan 
maths-General
maths-
The solution set of the inequation log1/3 (x2 + x + 1) + 1 > 0 is
The solution set of the inequation log1/3 (x2 + x + 1) + 1 > 0 is
maths-General
maths-
If
–5
+ 6 = 0 where a > 0, b > 0 & ab
1. Then the value of x is equal to
If
–5
+ 6 = 0 where a > 0, b > 0 & ab
1. Then the value of x is equal to
maths-General
maths-
No. of ordered pair satisfying simultaneously the system of equation
.
= 256 & log10
– log10 1.5 = 1 is.
No. of ordered pair satisfying simultaneously the system of equation
.
= 256 & log10
– log10 1.5 = 1 is.
maths-General
maths-
If
= 1/x2, then x =
If
= 1/x2, then x =
maths-General
maths-
If xn > xn–1 >...> x2 > x1 > 1 then the value of 
is equal to-
If xn > xn–1 >...> x2 > x1 > 1 then the value of 
is equal to-
maths-General
maths-
The expression logp
where
when simplified is.
The expression logp
where
when simplified is.
maths-General
maths-
Let N=
Then log2N has the value –
Let N=
Then log2N has the value –
maths-General
maths-
If a2 + 4b2 = 12ab, then log (a + 2b) =
If a2 + 4b2 = 12ab, then log (a + 2b) =
maths-General