Magnetic Field Due to Straight Current Carrying Conductor

Q.

What is magnetic dipole?

Q.

Why does a current carrying conductor experiences a force when placed in a region of magnetic field?

Q.

A wire of length $50cm$ moves with a velocity of $300m/min$, perpendicular to a magnetic field. If the$e.m.f$. induced in the wire is $2V$, the magnitude of the field in tesla is

1. $2$

2. $5$

3. $0.8$

4. $2.5$

Q.

Two free parallel wires carrying currents in opposite directions

1. attract each other

2. repel each other

3. get moved to perpendicular to each other

4. do not affect each other

Q.

Two free parallel wires carrying currents in opposite directions:

1. attract each other

2. do not affect each other

3. get moved to perpendicular to each other

4. repel each other

Q.

A charged particle enters a uniform magnetic field, parallel to the field, its Kinetic energy :

1. Remains constant

2. Decreases

3. Becomes zero.

4. Increases

Q.

The peak electric field produced by the radiation coming from the $8W$ bulb at a distance of $10m$ is

Q.

A bar magnet of length $14\mathrm{cm}$ is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of $18\mathrm{cm}$ from the center of the magnet. If ${\mathrm{B}}_{\mathrm{H}}=0.4\mathrm{G}$, the magnetic moment of the magnet is $(1\mathrm{G}={10}^{-4}\mathrm{T})$

1. $28.80{\mathrm{JT}}^{-1}$

2. $2.880{\mathrm{JT}}^{-1}$

3. $2.880\times {10}^3{\mathrm{JT}}^{-1}$

4. $2.880\times {10}^2\mathrm{J}{\mathrm{T}}^{-1}$

Q.

The radius of curvature of the path of the charged particle in a uniform magnetic field is directly proportional to

1. The charge on the particle

2. The momentum of the particle

3. The energy of the particle

4. The intensity of the field

Q. explain the following property of magnetic field lines "in the region of stronger field the lines converge and in the region ofweaker fields the line diverge

Q. 1.Figure shows the path of an electron in a region of uniform magnetic field . The path consists of two straight sections each between a pair of unifrmly charged plates and two half circles.Option are 1) plate 1 of pair A is at lower potential than plate2 of same pair 2) plate 1 of pair B is at lower potential than plate 2 of same pair 3) direction of the magnetic field is into the page 4 4)plate 1 of pair A is at hogher potential than plate 2 of the same pair

Q. for the hollow thin cylindrical current carrying pipe which statement is correct 1.magnetic field inside the pipe is not zero 2.magnetic field outside the pipe is zero 3.electric field outside the pipe is zero 4.electric field on the surface of pipe is

Q. Please give a detailed answer about How will the magnetic field intensity at the centre of a circular coil carrying current change, if the current through the coil is doubled and the radius of the coil is halved?

Q. As we move away from current carrying conductor, the spacing between the magnetic field lines:

1. Increases
2. Decreases
3. Remains same
4. Becomes zero

Q.

In spite of having both magnitude and direction why is electric current a scalar quantity not a vector quantity.

Q.

The commercial electric motors uses ____magnet to rotate the armature.

1. a permanent magnet

2. an electromagnet

3. a bar magnet
4. All of the above

Q. Equation F = ILB holds true only if:

1. direction of electric current makes an angle of 30 degrees with the direction of magnetic field.
2. direction of electric current makes an angle of 120 degrees with the direction of magnetic field.
3. direction of electric current is perpendicular to the direction of magnetic field.
4. direction of electric current is parallel to the direction of magnetic field.

Q. Why current is a scalar quantity?

Q.

A charged particle moving in a magnetic field experiences a resultant force

1. In the direction of field

2. In the direction opposite to that field

3. In the direction perpendicular to both the field and its velocity

4. None of the above

Q. A thin long wire carrying current I is placed along positive X Asia .The unit vector of magnetic field at a point (0, a, a)

Q.

The self-inductance of a straight conductor is…

1. zero

2. very large

3. very small

4. $\infty$

Q.

Main components of electrical motor are given below. Write their function

i) armature

ii) field magnet

iii) split ring commutator

iv) brushes or sliding contact

v) battery

Q.

If a conducting wire is placed along the x-axis and a current flow through it in the positive direction, it creates a magnetic field around it. Direction of the magnetic field at a point (0, -2) is

1. Positive y-direction

2. Negative z-direction

3. Negative y-direction

4. In the positive x direction

Q.

How do field lines of regions of strong field different from those of weak field

Q.

Calculate the total energy UB and the energy density Up of the magnetic field stored in a solenoid $0.5\mathrm{m}$ long, having $5000$turns and a current $10\mathrm{A}$. (radius of the solenoid is $4\mathrm{cm}$).

Q.

A moving charge will produce

1. Magnetic field

2. Electric field

3. no field

4. Both (a) and (b)

Q.

A current-carrying conductor placed in a magnetic field experiences a force. The displacement of the conductor in the 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 strength of the magnetic field produced by the current carrying conductor depends on:

1. Taking very thin long conductor
2. Increasing the intensity of current through the conductor
3. Taking the larger cross section conductor
4. Taking higher resistivity conductor

Q.

The given figure shows an electromagnet

What will be the polarity at the end X

1. North

2. South

3. Positive

4. Negative

Q.

What is motional emf?