Force on a Current Carrying Conductor

Q.

Can two similar charged bodies ever attract each other?

Q.

A stationary charge is placed in a magnetic field, it will experience a force.

1. True

2. False

Q. What can be said about the direction of force, if the current is reversed in the conductor placed in a magnetic field?

1. It changes by ${90}^{\circ }$.
2. It changes by ${45}^{\circ }$.
3. It will not change.
4. It will be reversed.

Q.

The direction of the force experienced by a conductor when placed in a magnetic field depends upon

1. the direction of current

2. the direction of a magnetic field

3. length of the conductor

4. material of the conductor

Q.

The direction of the deflection of a magnetic needle is given by

1. clock rule

2. right-hand rule

3. Ampere's swimming rule

4. Fleming's left-hand rule

Q. What happens to the force acting on current carrying conductor placed in a magnetic field when : A) Current in conductor increases B) length of conductor increases C) Direction of the current and magnetic field arereversed D) Direction of the current is reversed without changing the direction of magnetic field.

Q.

Is magnetic force perpendicular to current?

Q.

Two charged thermocol balls held close to each other move away from each other when they are released. Name the force which is responsible for this phenomenon.

Q.

Why does a current carrying conductor kept in a magnetic field experience force? On what factors does the direction of this force depend? Name and state the rule used for determination of direction of this force. [5 MARKS]

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. Opposite to the direction of the magnetic field due to the conductor
3. In the vertically upward direction
4. There is no force experienced

Q. A charged particle entering a magnetic field with a non-zero velocity in a direction parallel to a magnetic field is deflected by the field. State true or false.

1. False
2. True

Q.

In Fleming's left-hand rule, What does the thumb, forefinger and middle finger denote?

1. Field-Force-Current

2. Current-Field-Force

3. Force-Field-Current

4. Current-Force-Field

Q. Question 15 (a)
State the rule to determine the direction of a
(i) magnetic field produced around a straight conductor-carrying current.

Q.

A current carrying conductor placed in a magnetic field experiences a force. The amount of force experienced by the current carrying conductor in the magnetic field can be increased by

1. decreasing the magnetic field.

2. increasing the current in the conductor.

3. increasing the magnetic field.

4. decreasing the current in the conductor.

Q. What dose this mean "when a charged partice moves parallel (either in the same direction or in opposite direction ) to the magnetic field, the magnetic force acting on particle is zero What does parallel mean? Force on a moving charge in magnetic field

Q.

Explain why $\alpha$ and $\beta -$particles are deflected in an electric or a magnetic field but $\gamma -$rays are not deflected in such a field.

Q. Two long parallel wires carrying currents 2.0 A and 4.0 A respectively in opposite directions. The separation between the wires is 0.25 m. Calculate the force per unit length between them in the order of ${10}^{-6}$.Also, state whether it will be attractive or repulsive.Take magnetic permeability as ${\mu }_0=4\pi \times {10}^{-7}N/A^2$
Formula to be used, $F\left(perunitlength\right)=\frac{{\mu }_0{I}_1{I}_2}{2\pi d}$

1. 6, attractive
2. 4.5, repulsive
3. 4.5, attractive
4. 6.4, repulsive

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. Vertically upwards
2. Vertically downwards
3. Same as direction of current in wire 1
4. Opposite to the direction of current in wire 1

Q.

Current from a battery is flowing through a straight conductor. Which rule helps to understand the direction of the magnetic field around the conductor.

1. Fleming's left-hand rule

2. Clock rule

3. Fleming's right-hand rule

4. Right-hand thumb rule

Q. The force experienced by the magnet is due to the magnetic field of the current carrying conductor.

1. True
2. False

Q. On stretching a slinky, the regions where the coils become closer are called _____ and the regions where coils are further apart are called ____.

1. Compression, Trough
2. Compression, Rarefaction
3. Rarefaction, Compression
4. Rarefaction, Trough

Q.

A straight current carrying conductor is placed in a magnetic field but no force acts on it. What can be the reason behind this?

1. The conductor is perpendicular to the magnetic field.

2. The conductor is making ${60}^{\circ }$ with the magnetic field.

3. The conductor is making ${45}^{\circ }$ with the magnetic field.

4. The conductor is parallel to the magnetic field.

Q. What direction will the left arm experience a force in?

1. Out of the plane, away from you
2. Vertically upwards
3. It doesn’t experience any force
4. Out of the plane, towards you

Q. Question 15 (b)
State the rule to determine the direction of a
(ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.

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

Q.

The force due to the magnetic field on a current carrying conductor is _______ to the magnetic field and_________ to the current.

1. perpendicular, perpendicular

2. parallel, parallel

3. parallel, perpendicular

4. perpendicular, parallel