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Question : 22
Total: 36
(a) Draw magnetic field lines of a bar magnet. "Two magnetic field lines never intersect each other." Why ?
(b) An electric oven of1.5 kW ( 220 V ) 5 A
(b) An electric oven of
Solution:
(a) Two magnetic field lines never intersect each other. The direction of magnetic field lines is always from north pole to south pole. If two magnetic field lines intersect, then it means that at that point of intersection the compass needle is showing two different directions of magnetic field which is impossible.
(b)
Given : Power, ( P ) = 1.5 kW = 1.5 × 1 , 000
= 1 , 500 W
Voltage, ( V ) = 220 V
We know, P = V × I
⇒ I =
=
= 6.8 A
Now, the current drawn by the oven is 6.8 A which is very high but the fuse in this circuit has only5 A 6.8 A 5 A
(b)
Now, the current drawn by the oven is 6.8 A which is very high but the fuse in this circuit has only
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