A copper wire of radius r and length l has a resistance of R. A second – McqOptions

MCQOPTIONS

1.	A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be
A.	R
B.	R/4
C.	R/5
D.	/5
Answer» E.

Discussion

No Comment Found

Related MCQs

On a cold day when a room temperature is 15C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15C, because
oil raise up the wick in a lamp. The principle involves
MLT is the dimensional formula for
Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
On which of the following principles does a rocket in space work?
In the formula average velocity = (u + v)/2, u is the _________.
Due to an acceleration of 2 m/s2, the velocity of a body increases from 20 m/s to 30 m/s in a certain period. Find the displacement (in m) of the body in that period.
How many calories are there in a Joule?
If two charged bodies having equal potential are connected through a conducting wire, then: