Physics Test 24

Result

Physics Test 24

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Question 1
4 / -1

An electric dipole is placed at an angle of 30 ° to a non-uniform electric field. The dipole will experience

A
a torque only

B
a translational force only in the direction of the field

C
a translational force only in a direction normal to the direction of the field

D
a torque as well as translational force

Solution

Since the electric field is non-uniform, hence electric dipole will experience a force. Also, the electric dipole will experience a torque as the dipole vector is not parallel to the direction of the electric field.
Question 2
4 / -1

Given that, a planet in a distant solar system is 10 times more massive than the earth and its radius 10 times smaller, the escape velocity from the surface of the planet would be

A
110 km s^-1\

B
0.11 km s^-1

C
1.1 km s^-1

D
11 km s^-1.
Question 3
4 / -1

Needles N₁, N₂ and N₃ are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnetic, when brought close to them, will

A
attract all three of them

B
attract N₁ and N₂ strongly but repel N₃

C
attract N₁ strongly, N₂ weakly and repel N₃ weakly

D
attract N₁ strongly, but repel N₂ and N₃ weakly

Solution

The needle N₁will be strongly attracted by the magnet because it is ferromagnetic substance. And ferromagnetic substances retain the magnetism in them.
The needle N₂will be weakly attracted by the magnet because it is paramagnetic substance. And paramagnetic substances gets magnetized only in the presence of magnetic field.
The needle N₃will be weakly repelled by the magnet because it is diamagnetic substance. And diamagnetic substances do not retain the magnetism in them.