Magnetic Force

Q. 23.The force between two magnetic poles is F in air. If the pole strength of first pole is doubled, that of second pole is tripled and the distance between the poles is halved the force between the poles becomes and increases by 1)24F and 2300% 2)24F and 2400% 3)3/2F and 150% 4)2F and 100%

Q. Magnets are attached to two toy cars as shown below. The cars will attract each other.

1. True
2. False

Q.

What is magnetic force?

Q. Magnetic south pole of the earth is situated near

1. geographic south pole
2. geographic north pole
3. geographic east
4. geographic west

Q. Is electrostatic force a conservative force??

Q. Which instrument is used to determine the presence of magnetic field

Q. A uniform rod of length L mass M and carrying current I is kept on the top of an inclined plane of angle of inclination theta. There is a uniform magnetic field B acting perpendicular to the plane. The coefficient of friction of the surface of the incline plane is (mu). Find the maximum and minimum value of magnetic field B such that the rod is at rest. Given acceleration due to gravity is g.

Q.

Magnetic force is

1. only attracts in nature

2. repulsive in nature

3. both attractive and repulsive in nature

4. none of these

Q. Proof for electrostatic force is conservative force(using line integral)