Magnetic Force on Current Carrying Wire

Q. Question 18
What does the direction of thumb indicate in the right-hand thumb rule? In what way this rule is different from Fleming’s left-hand rule?

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 ${45}^{\circ }$.

Q. A current carrying conductor placed in a magnetic field experiences maximum force when angle between current and magnetic field is:

1. $\pi /2$
2. $3\pi /4$
3. $\pi /4$
4. zero

Q. A wire PQ carries a current 'i' placed perpendicular to a long wire XY carrying a current I. The direction of force on PQ will be:-

1. towards left
2. downwards
3. towards right
4. upwards

Q.

What is the orientation of a current carrying conductor relative to the direction of a magnetic field for:
(a) Maximum magnetic force
(b) Minimum magnetic force

Q. under what conditions is the force acting on a current carrying conductor in a uniform magnetic field minimum ??

Q. Please explain the Clock Face Rule.

Q.

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

1. Decreasing the magnetic field.

2. Decreasing the current in the conductor

3. Increasing the magnetic field

4. None of the above

Q.

The magnetic field associated with a current carrying straight conductor is in anticlockwise direction. If the conductor was held along east - west direction what will be the direction of current through it ? Also state the rule which is used to find the direction of current in this case

Q. Assertion :A current carrying conductor experiences a force in a magnetic field. Reason: The net charge on a current carrying conductor is zero.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. A straight wire of length 0.5 metre and carrying a current of 1.2 ampere is placed in a uniform magnetic field of induction 2 tesla. If the magnetic field is perpendicular to the length of the wire, the force acting on the wire is:

1. 2.4 N
2. 1.2 N
3. 3.0 N
4. 2.0 N

Q. State the condition when magnitude of force on a current carrying conductor placed in a magnetic field is maximum.

1. When current in conductor is in the direction of magnetic field.
2. When current in conductor is perpendicular to the direction of magnetic field.
3. Any orientation
4. When force in the direction of magnetic field
   

Q. An elastic circular wire of length l carries a current I. It is placed in a uniform magnetic field B (Out of paper) such that its plane is perpendicular to the direction of B. The wire will experience

1. No force
2. A stretching force
3. A compressive force
4. A torque

Q.

Explain with an experiment principle of Electromagnetic induction? Which law will gives the direction of electric current? [5 MARKS]

Q. A wire is lying horizontally in the north-south direction and there is a horizontal magnetic field pointing towards the east. Some positive charges in the wire move north and an equal number of negative charges move south. The direction of force on the wire will be :

1. East.
2. Down, into the page.
3. Up, out of the page.
4. West

Q. The magnetic force $\overline{F}$ on a current carrying conductor of length l in an external magnetic field $\overline{B}$ is given by:

1. $\frac{\overrightarrow{l}\times \overline{B}}{I}$
2. $\frac{I\times \overline{B}}{\overrightarrow{l}}$
3. $I(\overrightarrow{l}\times \overline{B})$
4. $I^2\overrightarrow{l}\times \overline{B}$

Q. State condition when magnitude of force on a current carrying conductor placed in a magnetic field is zero.

1. When current in conductor is in the direction of magnetic field.
2. None of these
3. Always zero
4. When current in conductor is perpendicular to the direction of magnetic field.

Q. The direction of force on a current carrying conductor placed in a magnetic field cannot be reversed by reversing the direction of magnetic field. Is the given statement true/false?

Q. The magnetic force per unit length on a wire carrying a current of 10 A and making an angle of ${45}^0$ with the direction of a uniform magnetic field of 0.20 T is

1. $2\sqrt{2}N{m}^{-1}$
2. $\frac{2}{\sqrt{2}}N{m}^{-1}$
3. $\frac{\sqrt{2}}{2}N{m}^{-1}$
4. $4\sqrt{2}N{m}^{-1}$

Q. A current-carrying wire in a magnetic field is subject to a magnetic force. If the current in the wire is doubled, what happens to the magnetic force acting on the wire?

1. It is quartered
2. It is quadrupled
3. It is unchange
4. It is halved
5. It is doubled

Q. what is the graph between current and distance in MAGNETIC FIELD DUE TO A STRAIGHT CURRENT CARRYING conductor

Q. A wire of length $l$ carries a current $i$ along the x-axis.A magnetic field $\overrightarrow{B}=B_o(\hat{j}+\hat{k})$ exists in the space.Find the magnitude of the magnetic force acting on the wire.

Q. A straight wire of mass $200g$ and length $1.5m$ carries a current of $2A$. It is suspended in mid air by a uniform horizontal magnetic field $B$. The magnitude of $B$ (in tesla) is :

1. $0.55$
2. $0.65$
3. $0.75$
4. $0.45$

Q. On a smooth plane inclined at ${30}^0$ with the horizontal, a thin current-carrying metallic rod is placed parallel to the horizontal ground. The plane is located in a uniform magnetic field of 0.15 T in the vertical direction. For what value of current can the rod remain stationary? The mass per unit length of the rod is 0.03 kg $m^{-1}$.

Q. On what factors does the direction of magnetic force depend?

Q. A straight wire of length $2m$ carries a current of $10A$. If this wire is placed in a uniform magnetic field of $0.15T$ making an angle of ${45}^{\circ }$ with the magnetic field, the applied force on the wire will be:

1. $1.5N$
2. $3\sqrt{2}N$
3. $\frac{3}{\sqrt{2}}N$
4. $3N$

Q. The magnetic force on a current carrying wire placed in uniform magnetic field if the wire is oriented perpendicular to magnetic field, is

1. $0$
2. $ILB$
3. $2ILB$
4. $ILB/2$

Q. A straight wire of mass 100 g and length m carries current of 2A. it is suspended in mid air by applying uniform horizontal magnetic field B perpendicular to wire. the magnitude of B is

1. 4t
2. 2T
3. 1T
4. 0.5T

Q. One metal wire is kept in east-west direction. $I$ is the current flow due west. Then force, due to magnetic field $\overrightarrow{B}$ of the earth on the wire is in the........ Direction.

1. downward
2. Upward
3. north
4. south

Q. A current of $3A$ is flowing in a linear conductor having a length of $40cm$. The conductor It is placed in a magnetic field of strength $500$ gauss and makes an angle of ${30}^o$ with the direction of the field. It experience a force of magnitude $n\times {10}^{-2}N$. Find the value of $n$