1i cldn get the last line of d ques...............
P and Q are two coaxial conducting loops separated by some distance. Wen te switch S is closed, a clockwise curent i1 flows in P and an indused current I1 flows in Q. The switch remains closed for a long time. Wen S is opened, a current I2 flows in Q.
then directions of 11 and I2 are:
1)respectively clockwise and anticlockwise.
2)both clockwise
3)both anticlockwise
4)resp. anti-cl and clockwise.
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15 Answers
1option 1)...... say whether correct..... i ll proceed wit ma explanation....
1357Initially As the switch is closed, magnetic field due to loop P is towards left
Now the current is induced in Q such that the magnetic field due to Q is opposite to P...... so current in Q is anticlockwise
Now when the switch is opened the current in loop Q will be clockwise
so the answer is (d)
1i think option 4 is correct as if initially the i in I1 clockwise the mag flux is increasing in I2 hence an anticlockwise current will grow to equalise the flux. then when circuit is closed the case is reversed
1after seein manish byahs post.. got a doubt whether d current thro q ll remain in sam direction after key s opened..........
1manish byah.. may i kno whether d current thro q is momentary????????
11Firstly the magnetic flux points left. Then as the current increases clockwise, q tries to oppose increase in flux towards left. So it sets up a current which increases magnetic field towards the right. So current in q will be anticlockwise :)
1there is one special thing about this question,
FROM WHICH DIRECTION WE OBSERVE CURRENT????????
when we observe current in Q from right side of Qthen (d) is correct
when we observe current in Q from left of Q (or P)
then (a) is correct.
the direction of observation must be specified......
RIGHT???????????//
1yes you are r8!
i think fiitjee ppl took it from left..
nothing is mentioned in the question...
1see the assertion of direction current is right ,but whatever be the direction understanding change in flux and its after effect on current is imp,so whatever happens the ans is either a) or d).
Plz comment..