Magnetic Field

Q.

Magnetic field lines never intersect each other because

1. There will be two directions of the field at the same point.

2. Feild lines repel each other

3. Field lines follow discrete paths only

4. If field lines intersect they create a new magnetic field within the existing field

Q.

What Is Magnetic Meridian?

Q.

What is Neutral Point in Electric Field?

Q.

The axis of earth's magnetic field is inclined with the geographical axis at an angle of about :

(a) $5^o$

(b) ${15}^o$

(c) ${25}^o$

(d) ${35}^o$

Q.

What is the function of the slip ring, contact brush of an AC generator, split ring and brushes of an electric motor?

Q.

In which direction does the magnetic field lines run inside a bar magnet?

1. From north to south

2. There are no magnetic field lines inside a bar magnet

3. From south to north

4. The field lines runs perpendicular to the north-south direction.

Q. If an electron revolves around a nucleus in a circular orbit of radius R with frequency n then magnetic field produced at the centre of the nucleus will be

Q.

What is Ampere Swimming Rule?

Q.

How electric fields are generated?

Q. Outside a magnet, the magnetic field lines originate at_______and ends at________.

1. north pole, east pole
2. north pole, south pole
3. south pole, north pole
4. north pole, west pole

Q. 104.If projected charge passes through a zero gravity region, remain undeviated or deflected then find possible cases of electric field and magnetic field in that region 1.E=0 and B=0 2.E=0 and B is not equal to 0 3. E and B is not equal to zero 4.E is not equal to zero and B=0

Q. A charged particle has a acceleration a =2i^ + xj^ in a magnetic field B=-3i^+2j^-4k^. The value of x

Q. a wire is bent in the form of an equilateral triangle of side 100 cm and carries a current of 2A.it is placed in a magnetic field of induction 2T directed perpendicular into the plane of paper .the direction and magnitude force acting on each side of the triangle will be

Q.

Explain the graphical representation of the electric field in terms of field lines.

Q. 7. A sold cylindrical wire of radius R carries a current I. The magnetic field 5uT at a point which is 2R distance away from the axis of were. the magnetic field at a point which is R/3 distance inside from surface of the wire is . 1)10/3uT 2)20/3uT 3)5/3uT 4)40/3uT

Q. A particle of specific charge alpha (charge/mass) startmoving from origin under action of an electric fieldE Eoi and magnetic field B-Bok. Its velocity at(xo.Y0, 0) is 4j +3j. The value of xo is

Q.

Statement 1: When iron fillings are spread around a magnet, they align themselves as shown.

Statement 2: Magnetic field of the magnet, apply force on each filing which makes them get oriented in the mentioned way.

1. Both statements are correct and statement 2 is the correct explanation for statement 1

2. Both statements are correct but statement 2 is not the correct explanation for statement 1

3. Statement 1 is correct but statement 2 is incorrect

4. Both statements are incorrect

Q.

I- Shaped magnet is stronger than U- Shaped magnet(T/F)

1. True

2. False

Q.

A magnetic field has which of the following properties:

1. Magnitude
2. Direction
3. Colour

1. Only 1
2. 1 and 2
3. 1, 2 and 3
4. 1 and 3

Q. Si unit of Magnetic fleld intensity

Q.

The shape of the earth's magnetic field resembles that of an imaginary:

(a) U-shaped magnet

(b) Straight conductor carrying current

(c) Current-carrying circular coil

(d) Bar magnet

Q. A circular coil having N turns is made from a wire of length L metre. If a current of 1 ampere is passed through it and placed in a magnetic field of B tesla, the maximum torque on it is:- (1)inversely proportional to N^2 (2)inversely proportional to N (3)directly proportional to N (4)independent of N

Q. A bar magnet when placed at an angle of 30 degree to the direction of magnetic field induction of 5(10)-2 T, experiencing a moment of couple 25 (10)-6 Nm.If the length of the magnet is5 cm, its pole strength is?

Q. 2.When the intensity of magnetic field is increased four times, the time-period of suspended magnetic needle becomes (1) double (2) half (3) four times (4) one-fourth less

Q. What does "magnetic field is linear in its source *I.dl*" mean? What does in refers to as in the statement?

Q.

Question 1
Which of the following correctly describes the magnetic field near a long straight wire?
(a) The field consists of straight lines perpendicular to the wire.
(b) The field consists of straight lines parallel to the wire.
(c) The field consists of radial lines originating from the wire.
(d) The field consists of concentric circles centered on the wire.

Q. Which of these properties of magnetic field is the reason beacause of which magnetic field lines never intersect?

1. Magnetic field can have multiple directions at a point.
2. Magnetic field can have only one direction at a point.
3. Magnetic fields decrease in strength as we move away from the magnet.
4. Magnetic fields exert force on other magnets.

Q.

What is the strength of the magnetic field around a thin, long straight conductor?

Q. What are the properties of the magnetic field?

Q.

Question 19
Meena draws magnetic field lines of field close to the axis of a current carrying circular loop. As she moves away from the centre of the circular loop she observes that the lines keep on diverging. How will you explain her observation?