Home
Class 12
PHYSICS
A metal rod of length 10 cm and a rectan...

A metal rod of length 10 cm and a rectangular cross-section of `1cmxx(1//2)`cm is connected to a battery across opposite faces. The resistance will be

A

maximum when the battery is connected across `1 cm xx1/2 cm` faces.

B

maximum when the battery is connected across 10 cm `xx` 1 cm faces.

C

maximum when the battery is connected across 10 cm `xx 1/2` cm faces

D

same irrespective of the three faces.

Text Solution

Verified by Experts

Promotional Banner

Similar Questions

Explore conceptually related problems

A metal rod of the length 10cm and a rectangular cross-section of 1 cm x 1//2 cm is connected to a battery across opposite faces. The resistance will be

A metel rod of the length 10cm and a rectangular cross-section of 1 cm xx 1//2 cm is connected to a battery across opposite faces. The resistance will be

A metel rod of the length 10cm and a rectangular cross-section of 1 cm xx 1//2 cm is connected to a battery across opposite faces. The resistance will be

A copper rod of length 20cm and cross-sectional area 2mm^(2) is joined with a similar aluminium rod as shown in figure .Find the resistance of the combination between the ends, Resistivity of copper =1.7xx10^(-8)(Omega)m and that of aluminium =2.6xx10^(-8)(Omega)m .

A potentiometer wire of length 1 m has a resistance of 10Omega . It is connected to a 6V battery in series with a resistance of 5Omega . Determine the emf of the primary cell which gives a balance point at 40cm.

A copper rod with length 1.4 m and area of cross-section of 2 cm^2 is fastened to a steel rod with length L and cross-sectional area 1 cm^2 . The compound rod is subjected to equal and opposite pulls to magnitude 6.00xx10^4 N at its ends . (a) Find the length L of the steel rod if the elongation of the two rods are equal . (b) What is stress in each rod ? (c ) What is the strain in each rod ? [Y_"steel"=2xx10^11 Pa , Y_(Cu)=1.1xx10^11 Pa]

The temperature of a wire of length 1 metre and area of cross-section 1 cm^(2) is increased from 0^(@)C to 100^(@)C . If the rod is not allowed to increased in length, the force required will be (alpha=10^(-5)//.^(@)C and Y =10^(11) N//m^(2))

The ends of a copper rod of length 1m and area of cross-section 1cm^2 are maintained at 0^@C and 100^@C . At the centre of the rod there is a source of heat of power 25 W. Calculate the temperature gradient in the two halves of the rod in steady state. Thermal conductivity of copper is 400 Wm^-1 K^-1 .

The ends of a copper rod of length 1m and area of cross-section 1cm^2 are maintained at 0^@C and 100^@C . At the centre of the rod there is a source of heat of power 25 W. Calculate the temperature gradient in the two halves of the rod in steady state. Thermal conductivity of copper is 400 Wm^-1 K^-1 .

Find the thermal resistance of an aluminium rod of length 20cm and area of cross section 1cm^(2) . The heat current is along the length of the rod. Thermal conductivity of aluminium =200Wm^(-1)K^(-1) .