Here V is changed to 2V
and so current changes from I to 2I

Therefore,2V=2IR
which implies,V=IR
Hence remains the same.

Naren Raja said:
(Wed, Oct 5, 2011 11:16:53 AM)

Resistor value is fixed and it will not change.

Bajrang said:
(Mon, Oct 10, 2011 11:33:23 PM)

On changing I proportional voltage, the current also change by same extent and we know that R is directly proportional to V and inversly proportional to I hence answer is B.

Vimala said:
(Wed, Dec 14, 2011 10:32:34 PM)

Thanks eleczee.

Tayyaba said:
(Sun, Jun 3, 2012 03:22:09 PM)

Voltage and current are proportional to each other and are is a constant:.
V=IR.
(2V) = (2I)R.
V=IR.

Gil said:
(Sun, Jul 1, 2012 11:24:19 AM)

Pay attention to the words that is being used in the problem.
ACROSS means = parallel to the resistor.
And THROUGH means = series to the resistor.

Since,
Voltage at parallel is the same.
Current in series is the same.
We can say that Vb=2volts & Ib=2amperes in the Second Equation.

Therefore.
Using the ohms law : I = V/R.

Equation 1 : Ra = 1Va/1Ia is 1ohm.
Equation 2 : Rb = 2Vb/2Ib is 1ohm.

Conclusion.

Rb=Ra=1ohm therefore The value of the resistor remains the same and did not change.

Dileepkumar said:
(Sat, Aug 25, 2012 05:41:44 PM)

Once fix the resistor if then the applied current&voltage is varied randomly ,the resistance not changed.
how ever ,
we know that ohm's law
V=IR;
GIVEN THAT V=2V;
I=2I;
WE SUBSTITUTE THE OHMS LAW IN ABOVE GIVEN EQATIONS
R=2V/2I
R=V/I,
SO THE RESISTANCE VALUE IS NOT CHANGED BY VARIENG THE CURRENT AND VOLTAGE.

Sundara Pandian said:
(Sat, May 18, 2013 01:41:41 PM)

According to Ohms law,

V=IR and R=V/I.
If V doubles and it become 2V and I doubles and it become 2I.