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Science CBSE Homework Assignments
Class 10
Magnetic effects of electric current
Introduction to electro magnetism
3.
NTSE questions and solutions
Task:
2
m.
Choose the correct answer
:
1
.
How many times does the polarity of an A.C. supply of frequency 50 Hz change in one second?
50
100
25
200
2
.
At every point of a current carrying circular loop, the concentric circles representing the magnetic fields around it would become
(1) larger and larger as we move away from the wire
(2) so large at the centre of circular loop that they look like straight lines
Both (1) and (2)
Neither (1) nor (2)
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