Force on a Straight Current Carrying Conductor Placed in a Magnetic Field

Q.

What is the meaning of F=qE

Q. Which rule is applied to find the direction of force acting on a current carrying wire, placed in a magnetic field?

1. Fleming's right hand rule
2. Fleming's left hand rule
3. Right hand thumb rule
4. Lenz Law

Q. A current of 2 A is flowing through a rectangular coil.
In which direction will the coil move due to magnetic field
produced by the current flowing in the same coil?

1. Into the page
2. Out of the page
3. Remains unaffected
4. Insufficient data

Q. 60. A particle of charge per unit mass alpha is released from origin with a velocity v=vo icap in a uniform magnetic field B=-Bo kcap.If the particle passes through (0, y, 0) then y is equal to

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

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

Q.

Forces acting on a stationery charge in the magnetic field B is

1. Proportional to the magnitude of charge

2. Increases with increase in magnetic field

3. 0

4. None of the above

Q.

Force experienced by a current-carrying conductor placed in a magnetic field is largest when the angle between current and magnetic field is

1. $0^{\circ }$

2. ${90}^{\circ }$

3. ${45}^{\circ }$

4. ${180}^{\circ }$

Q.

How do moving charges create a magnetic field?

Q.

What is the force on a current-carrying wire that is parallel to a magnetic field ? Give reason for your answer.

Q.

What is K in magnetic field?

Q.

What happens when a current-carrying conductor is placed in a magnetic field ?

Q.

When the direction of current through the conductor is reversed, then direction of

1. electric field is also reversed

2. electromagnetic field is reversed

3. force is also reversed

4. force remains same

Q.

Using the concept of force between two infinitely long parallel current-carrying conductor, define one ampere of current

Q. The radius of a circular loop is 0.5 m and the current passing through the loop is 10A. The magnitude of magnetic field at the centre of the loop is
$(Given{\mu }_0=4\pi \times {10}^{–7}Tm/A)$

1. $\pi \times {10}^{-7}T$
2. $4\pi \times {10}^{-6}T$
3. $4\pi \times {10}^{-7}T$
4. $2\pi \times {10}^{-7}T$

Q.

How will the strength of the magnetic field change when the point where the magnetic field is to be determined is moved away from the straight wire carrying constant current? Justify your answer.

Q.

How will the direction of force be changed, if the current is reversed in the conductor placed in a magnetic field ?

Q.

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

State condition in each case for the magnitude of force on a current carrying conductor placed in a magnetic field to be (a) zero, and (b) maximum.

Q.

The magnitude of the force acting on a current carrying wire placed in a magnetic field in the direction perpendicular to its length depends on ___.

1. length of the wire

2. current I flowing in the wire

3. strength of magnetic field

4. mass of wire

Q. A current carrying loop is placed near a long straight wire which also conducts a current. The direction of currents are shown in the figure, then which of the following options are correct?

1. The wire is attracted towards the loop
2. The wire is repelled from the loop
3. The wire does not experience any force
4. The wire will have attraction or repulsion depending on the magnitudes of the currents

Q. A particle of mass m and charge q is released from origin in a region occupied by electric field E directed along x-axis and magnetic field directed along negative x-axis, speed of particle at position x is

Q.

Name three factors on which the magnitude of force on a current carrying conductor placed in a magnetic field depends and state how does the force depend on the factors stated by you.

Q.

A solenoid $30cm$ long is made by winding $2000$ loops of wire on an iron rod whose cross-section is $1.5c{m}^2$. If the relative permeability of the iron is $6000$. What is the self inductance of the solenoid?

1. $15H$

2. $2.5H$

3. $3.5H$

4. $0.5H$

Q.

The force experienced by a current-carrying conductor placed in a magnetic is the largest when the angle between the conductor and the magnetic field is:

(a) ${45}^o$ (b) ${60}^o$ (c) ${90}^o$ (d) ${180}^o$

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. 4.5, attractive

2. 6, attractive

3. 6.4, repulsive

4. 4.5, repulsive

Q.

The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is

Q. A current carrying wire is placed in a uniform magnetic field (outward to the plane of paper) as shown below. The direction of the magnetic force experienced by conductor is towards

1. North
2. East
3. South
4. West

Q. 55.A circular coil of wire carries a current. PQ is a part of a very long wire carrying a current and passing close to the circular coil. If the direction of the current are those as shown what is the direction of force on PQ.

Q.

(a) A current-carrying conductor is placed perpendicularly in a magnetic field. Name the rule which can be used to find the direction of force acting on the conductor.

(b) State two ways to increase the force on a current-carrying conductor in a magnetic field.

(c) Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.

Q.

A magnetic field exerts no force on :

(a) an electric charge moving perpendicular to its direction (b) an unmagnetised iron bar

(c) a stationary eletric charge (d) a magnet