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 small drop of oil spreads over water because :

Oil has a higher viscosity

Water has a higher surface tension

Oil has a higher surface tension

Water has a higher viscosity

Oil has a higher viscosity

Water has a higher surface tension

Oil has a higher surface tension

Water has a higher viscosity

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Physics
The freezing point of fresh water is ________ .

4°C

3°C

0°C

5°C

4°C

3°C

0°C

5°C

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Physics
Which conservation principle is applicable in the case of the motion of a rocket?

Conservation of energy

Conservation of charge

Conservation of momentum

Conservation of mass

Conservation of energy

Conservation of charge

Conservation of momentum

Conservation of mass

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Physics
A dynamo is used to convert

Electrical energy into magnetic energy

Magnetic energy into mechanical energy

Electrical energy into mechanical energy

Mechanical energy into electrical energy

Electrical energy into magnetic energy

Magnetic energy into mechanical energy

Electrical energy into mechanical energy

Mechanical energy into electrical energy

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The rubber ball suffers greater change in momentum

The initial momentum of the rubber ball is greater than that of the metal ball

The metal ball suffers greater change in momentum

Both suffer the same change in momentum

The rubber ball suffers greater change in momentum

The initial momentum of the rubber ball is greater than that of the metal ball

The metal ball suffers greater change in momentum

Both suffer the same change in momentum

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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 small drop of oil spreads over water because :

Physics The freezing point of fresh water is ________ .

Physics Which conservation principle is applicable in the case of the motion of a rocket?

Physics A dynamo is used to convert

Physics A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

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 small drop of oil spreads over water because :

Physics
The freezing point of fresh water is ________ .

Physics
Which conservation principle is applicable in the case of the motion of a rocket?

Physics
A dynamo is used to convert

Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that