A bar magnet and a metal ring are located as shown

The metal ring is supported by weightless threads, so it is free to move. The bar magnet is being moved to right and left. Which of the following correctly matches the direction of force on the metal ring for the given motions of the bar magnet?

  A bar magnet is aligned along the axis of a conducting loop. The m-sx-yw )c z.kbagnet and the loop move with velocities as given si.b-yzxkcs)- w tuations$K$,$L$, and $M$. The distance between the bar and loop is the same in all scenarios.


Which is correct about the magnitudes of induced emf, $ε$, at the instant shown in each situation?

  A loop of area $5.0\,cm^2$ is placed in a uniform magnetic field of $10\,mT$. The loop rotates around the vertical axis with a period of $4.0\,s$.



What is the magnitude of the change in magnetic flux linkage after 2.0s?

  A conducting rod of leni+ojncoa2 )mfit 7l ,;i70xgk gth $L$ is moved in a region of uniform magnetic field $B$ to light the filament bulb with a resistance of $R$. The direction of the magnetic field is out of plane.


What is the maximum output power of the bulb?

  The current $I$ in the conductor wire $X$ is decreasing which induces currents both in loops $Y$ and $Z$. The conductor wire and the loops lie in the same plane.


What is the direction of the induced currents in loop $Y$ and loop $Z$?

  A circular disc magnet and a conducting ring are locatrdhra*eb-z3;.z 8vt ded as shown.

The circular disc magnet turns around the vertical axis with a constant angular frequency of $ω$. Which of the following graphs could show the variation of induced current in the conducting ring with time for one revolution of the magnet?

  A conducting rod is moving in c*ayuy8i4q3x1b nz vqhbm ;4 3a magnetic field which is in the direction of out of the page as shown. It is moved in the direction of Side C (opposite to side Ac38b*ym 1 h biqx4q4v;y3zna u) by a force $F$

What is the direction of the electric field established in the conducting rod?

  A conductor coil is rotating around a fixed axis in a magnetic field. As a result, an alternating current is generated. The graph below shows the variation of output power with time.


Which graph will represent the variation of power output with time when the frequency of rotation of the coil is doubled?

  X, Y and Z are three plane coils. They are parallel to each other and sh2(y r y2ppf et6x enzsmt+l/9:are the same central axis. There is a constant current in the/zx:nrsty(y9m 2tfep6p 2e+ l fixed positioned coil Y.


Both coils X and Z are moved to the right. What are the directions of the induced currents in coil X and coil Z relative to coil Y?

  A conducting rod with a length of $0.20\,m$ is placed on two parallel conducting rails KL and MN as shown.


The uniform magnetic field (into the page) is normal to the plane of the conducting rails and has a magnitude of $5.0\,T$. A resistance of $1.5\,Ω$ is connected between the ends L and N of the rails. The copper rod moves at a constant speed of $3.0\,ms^{−1}$ in the direction shown. What is the magnitude and the direction of induced current passing through the resistor?

  Two electric circuits with identical cells and resistances are on the same plane with the conductor loop as shown. Switch X is open and Switch Y is closed at the beginning and the center of the loop is at the same distance to the circuits.


Which of the following statement(s) is/are true about the induced current in the loop when changes to the switch positions are made?
I. When only switch X is closed the induced current will be in anti-clockwise direction.
II. When only switch Y is opened the induced current will be in clockwise direction.
III. When switch X is closed and switch Y is simultaneously opened there will be no induced current on the loop.

  There are four conducting coils K, L, M, and N. Each loop a: u60 h8ezlccmoves from a region where the magn6uc8 ah0cze :letic field is zero into a uniform magnetic field, inducing either a clockwise or counterclockwise current in the loops. The speed of each coil is given, and the dimensions can be seen from the grid.



Which statement(s) are correct about the instant when the loops enter the magnetic field?
I. The magnitude of induced emf in the coil K equals the emf in coil M.
II. The magnitude of induced emf in coil M equals the emf coil N.
III. The induced current in coil K is in the opposite direction to the induced current in coil L.

  A pair of vertical conducting rails are placed in a uniform magnetic field of $0.40\,T$ directed out of the plane of the paper, as shown. A $30\,Ω$ resistor is placed on a $0.2\,m$ long conducting rod that can slide vertically downwards on the rails under the effect of gravity.





1.State and explain the direction of the current passing through the ammeter when the rod moves downwards.
2.The rod is released from rest and moves downwards along the rails. Explain how the induced current in the rod changes over time.
3.(1)At a given instant, the rod's velocity reaches $0.30\,ms^{−1}$. Calculate the magnitude of the induced emf in the loop formed by the rod and the rails.
(2)Calculate the induced current in the loop at this point in time. $I_{ind}$ =    $\times10^{-3}$

  Two identical magnets with opposite b*hoqwq /o **; k7fokpmfe7q6m +3ehqpoles facing inward are placed and fixed in a circular track as shown. The magnetic field linqmq73oho*7o* e;fw/h + p6fkmk*qbqees between magnets pass through a conducting loop which is also shown. The circular track rotates around the conducting loop with an angular frequency of $ω$. As the track rotates an emf is induced on the loop.



(a) Explain, with reference to the diagram, how the rotation of the generator produces an emf in the loop.
2.(1)The graph shows how the induced emf varies with time



The equivalent resistance of the conductor loop is $0.50\,kΩ$.
Calculate the rms value of the induced current in the loop. State your answer to an appropriate number of significant figures. $I_{rms}$ =    A
(2)Calculate the average power generated on the loop. $P_{av}$ =    W
3.Comment on the effect of each of the following on the graph of induced current through the loop versus time:
(1)An increase in angular velocity $ω$
(2)An increase in the strength of magnets

  A conducting rod with a leq6w) l1w dsl(bjbkran06 r 9(pngth of l is rotating around vertical axis with constant angular velocity ω in a 9l 6b6(s)nkpwlad1br0w q j(rregion of uniform vertical magnetic field B.


What is the emf between the ends of the rod (O and X)?

  A triangular conducting loop with t8l9kvrldn z/ cl lk -,v5rqg5vh08pk9he dimensions shown moves horizontally to the right with a consthrvl lv 98 rvkn0 /q-z9lk,dp lc585gkant velocity of $13.0\,cms^{−1}$. At $t=0$ the loop enters a uniform $1.2\,T$ magnetic field which is directed into the plane of the paper. There are 75 turns of the wire on the loop.



1.Define magnetic flux linkage $Φ$
2.(1)Calculate the magnetic flux linkage on the loop when the loop is entirely in the uniform magnetic field. State your answer with the appropriate unit. $Φ$ =    $\times10^{-1}$
(2)Draw, on the axes, a graph to show the variation with time of the magnetic flux linkage in the loop, starting from the point in time where the leading edge enters the region of magnetic field. Include values for time on the horizontal axis.



3.(1)Calculate the magnitude of the average induced emf on the loop for the time period where it enters the magnetic field. $ε_{av}$ =    V
(2)Draw, on the axes, a graph to show the variation with time of the emf induced in the loop.