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The direction of magnetic lines of force of a bar magnet is

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Important Questions on Magnetic Effects of Electric Current

EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
State right hand thumb rule.
EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
What is a magnetic field?
EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
The strength of magnetic field
HARD
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Write the characteristic of magnetic field lines.
EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Inside a bar magnet, the magnetic lines of force
MEDIUM
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines

Observe the given figure of Fleming' s Right Hand Rule and write the labels of A and B correctly.

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MEDIUM
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Explain how does a solenoid behave like a magnet. When is the force experienced by a current-carrying conductor placed in a magnetic field largest? 
MEDIUM
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Write any three properties of magnetic field lines.
EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Write the four important properties of the magnetic field lines due to a bar magnet. 
HARD
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Draw the pattern of magnetic field lines produced around a current carrying straight conductor passing perpendicularly through a horizontal cardboard. State and apply right-hand thumb rule to mark the direction of the field lines. How will the strength of the magnetic field change when the point where magnetic field is to be determined is moved away from the straight conductor? Give reason to justify your answer.
EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines

Write characteristics of magnetic field lines.

HARD
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns/length and carries a current I. The electron gun shoots an electron along the radius of the solenoid with speed v. If the electron does not hit the surface of the solenoid, maximum possible value of v is (all symbols have their standard meaning):

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MEDIUM
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Mention two properties of magnetic field lines.
MEDIUM
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
State the differences between magnetic field and magnetic field line.
EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Magnetic lines form continuos closed loops. Why?
EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
From which pole of magnet do magnetic field lines come out?
EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Write three properties of magnetic lines of forces.
EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Write the four important properties of the magnetic field lines due to a bar magnet.
HARD
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines

The diagram below shows a magnetic needle kept just below the conductor AB which is kept in the North-South direction.

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i) In which direction will the needle deflect when the key is closed?

ii) Why is the deflection produced?

iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB?

iv) Name one device which works on this principle.

EASY
Science>Physics>Magnetic Effects of Electric Current>Magnetic Field and Field Lines
Why can't two magnetic field lines intersect?