Solving time: 3 mins
Predict the direction of induced current in the situations described by the following Figs. 6.18(a) to (f ).
Text solutionVerified
The direction of the induced current in a closed loop is given by Lenz’s law. The given pairs of figures show the direction of the induced current when the North pole of a bar magnet is moved towards and away from a closed loop respectively.
Using Lenz’s rule, the direction of the induced current in the given situations can be predicted as follows:
(a) The direction of the induced current is along qrpq.
(b) The direction of the induced current is along prqp.
(c) The direction of the induced current is along yzxy.
(d) The direction of the induced current is along zyxz.
(e) The direction of the induced current is along xryx.
(f) No current is induced since the field lines are lying in the plane of the closed loop.
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Arrange the object pin O, the lens L and the image pin I on an optical bench or a
table top as shown in Figure 2 below. Adjust the heights of the object pin O and the
image pin I so that the tips of O and I lie on the principal axis of the lens.
(ii) Place the object pin O at the 0 cm mark and the lens L at the 30·0 cm mark, so that
the object distance u = 30·0 cm (i.e. the distance between the lens and the object pin).
(iii) Look at the tip of the object pin O through the lens from a distance so that you see
an inverted image (say Iʹ) of the object pin.
(iv) Now, adjust the position of the image pin I in such a way, that there is no parallax
between I and Iʹ. Ensure that tip to tip parallax is removed.
(v) At no parallax, note the position of the image pin I and measure the image distance
v = LI (i.e. the distance between the lens and the image pin) in cm, correct up to
one decimal place.
(vi) Repeat the experiment for four more values of u, i.e. u =40·0 cm, 50·0 cm, 60·0 cm
and 70·0 cm.
(vii) For each value of u, calculate m = v/u and f =
𝑣
𝑚+1
up to three significant figures.
(viii) Tabulate all five sets of u, v, m and f with their units (if any).
(ix) Show the image position when the parallax has been removed, in any one of the
readings in (viii) above, to the Visiting Examiner.
(x) Find F, the average of all the five values of f from the observation table and record
its value with proper units. Write your answer up to one decimal place.
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Question Text | Predict the direction of induced current in the situations described by the following Figs. 6.18(a) to (f ). |
Updated On | Jul 11, 2023 |
Topic | Electromagnetic Induction |
Subject | Physics |
Class | Class 12 |
Answer Type | Text solution:1 Video solution: 1 |
Upvotes | 157 |
Avg. Video Duration | 6 min |