Concept of System

Q. What is the momentum of a man of mass $100\text{kg}$ when he walks with a uniform velocity of $2{\text{m s}}^{-1}$?

a) $300{\text{kg m s}}^{-1}$
b) $50{\text{kg m s}}^{-1}$
c) $100{\text{kg m s}}^{-1}$
d) $200{\text{kg m s}}^{-1}$

[1 Mark]
[Momentum]

Q.

A mass m₁ has a velocity of u and mass m₂ has a velocity of v. Then find the individual momentum of mass m₁ and mass m₂ respectively.

1. M₁v and M₂u

2. Both have zero momentum

3. M₁u and M₂v

4. None of the above

Q.

Choose the correct statement:

Statement 1: A body moves along the direction of force.

Statement 2: A body moves in the direction of velocity.

Statement 3: Forces acting inside the system are called interior forces.

Statement 4: Forces acting outside the system are called external forces.

1. Except statement 2, all other statements are correct.

2. All statements are correct.

3. Except statement 2 and 3, all other statements are correct.

4. Only statement 2 and 4 are correct.

Q.

Choose the correct statement:

Statement 1: A body moves along the direction of force.

Statement 2: A body moves in the direction of velocity.

Statement 3: Forces acting inside the system are called interior forces.

Statement 4: Forces acting outside the system are called external forces.

1. All statements are correct.

2. Except statement 2, all other statements are correct.

3. Except statement 2 and 3, all other statements are correct.

4. Only statement 2 and 4 are correct.

Q. The magnetic field lines are ____ near a straight current carrying wire.

1. Elliptical
2. Circular
3. Parabolic
4. Straight

Q. Question 9
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?

Q.

When a current carrying conductor is placed next to a fixed bar magnet, it experiences a force:

1. In the direction of the magnetic field due to the conductor

2. In the vertically downward direction

3. In the vertically upward direction

4. Opposite to the direction of the magnetic field due to the conductor

Q.

A conductor is carrying a current, and a magnet is placed next to it as shown. Now it is known that the magnet moves away from you perpendicular to the plane. What should be the current in another wire (shown in green) in order to keep the magnet in place? (Consider the force only on the north pole)

1. Opposite to the direction of current in wire 1

2. Same as direction of current in wire 1

3. Vertically downwards

4. Vertically upwards

Q. The magnetic field lines are ____ near a straight current carrying wire.

1. Elliptical
2. Circular
3. Parabolic
4. Straight

Q. In which of the following cases a straight current-carrying conductor does not experience a force?

1. The direction of the current is perpendicular to the magnetic field.
2. The direction of the current is parallel to the magnetic field.
3. The angle between the conductor and the magnetic field is ${60}^{\circ }$.
4. The angle between the conductor and the magnetic field is ${45}^{\circ }$.