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

Physics
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

4 R/5

R/5

5 R/4

5 R

4 R/5

R/5

5 R/4

5 R

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Physics
A copper disc has a hole. If the disc is heated, the size of the hole

Decreases

Increases

First increases and than decreases

No change

Decreases

Increases

First increases and than decreases

No change

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Physics
The composition of electrician solder is

Lead-37%, Steel-63%

Lead-37%, tin-63%

Steel-37%, copper-63%

Iron-37%, tin-63%

Lead-37%, Steel-63%

Lead-37%, tin-63%

Steel-37%, copper-63%

Iron-37%, tin-63%

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Physics
In a water lifting electric pump, we convert

Kinetic energy into Electrical energy

Kinetic energy into Potential energy

Electrical energy into Kinetic energy

Electrical energy into Potential energy

Kinetic energy into Electrical energy

Kinetic energy into Potential energy

Electrical energy into Kinetic energy

Electrical energy into Potential energy

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Physics
What is the gravity of moon as compared to the Earth

1/8 th of Earth

1/6 th of Earth

1/4 th of Earth

1/5 th of Earth

1/8 th of Earth

1/6 th of Earth

1/4 th of Earth

1/5 th of Earth

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Physics
Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.

2000

80

4000

40

2000

80

4000

40

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Physics

Physics 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

Physics A copper disc has a hole. If the disc is heated, the size of the hole

Physics The composition of electrician solder is

Physics In a water lifting electric pump, we convert

Physics What is the gravity of moon as compared to the Earth

Physics Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.

Physics
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

Physics
A copper disc has a hole. If the disc is heated, the size of the hole

Physics
The composition of electrician solder is

Physics
In a water lifting electric pump, we convert

Physics
What is the gravity of moon as compared to the Earth

Physics
Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.