CBSE Guess > Papers > Question Papers > Class X > 2008 >Science > Science Theory

Ans. (a) Activity to demonstrate the pattern of magnetic field lines around a straight conductor carrying current :-

• A straight vertical wire AB passes through a cardboard sheet C.
• The ends of the wire AB are connected to a battery through switch.
• When current is passed through wire AB, it produces a magnetic field around it.
• This magnetic field has magnetic field lines around the wire AB which can be shown by sprinkling iron filings on the cardboard C.
• The iron filings get magnetised. And on tapping the cardboard sheet, the iron filings arrange themselves in circles around the wire showing that the magnetic field lines are circular in nature.

(b) The direction of magnetic field produced by a straight current carrying conductor can be obtained by using Maxwell’s Right-hand thumb rule. It states that : Imagine that you are holding the current carrying wire in your right hand so that your thumb points in the direction of current, then the direction in which your fingers encircle the wire will give the direction of magnetic field lines around the wire.

(c)

Science 2008 Question Papers Class X
Delhi		Outside Delhi		Compartment Delhi		Compartment Outside Delhi
	All Sets (PDF)				Set 1		Set 1
					Set 2		Set 2
					Set 3		Set 3