Magnetics 2 Question 15
15. An infinitely long conductor is bent to form a right angle as shown in figure. A current flows through . The magnetic field due to this current at the point is . Now, another infinitely long straight conductor is connected at , so that current is in as well as in , the current in remaining unchanged. The magnetic field at is now . The ratio is given by
(a)
(b) 1
(c)
(d) 2
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Answer:
Correct Answer: 15. (a, d)
Solution:
Magnetic field at due to Magnetic field at due to . But magnetic field at due to
Now
- magnetic field at
due to (current ) - magnetic field at
due to
NOTE Magnetic field at any point lying on the current carrying straight conductor is zero.