Magnetic Forces and Fields Chapter 19 13. The diagram at left shows a magnet tha

Question

Magnetic Forces and Fields Chapter 19 13. The diagram at left shows a magnet that has been placed near a wire. When the switch is closed, the magnet is deflected as shown, with the south pole dropping into the page and the north pole coming out of it. rotation of magnet a) Find the direction of the current through the b) Which terminal of the battery, A or B, is the c) Find the direction of the net force exerted by the wire. Explain your reasoning. positive terminal of the battery? magnet on the current at the instant shown in the diagram. Explain. 14". The current in a wire is directed into the page as shown. The magnetic field at a point to the right of the wire is represented by which arrow? Justify your answer 15. ew of a compass next to a wire. The north pole The figure below shows the top vi of the c cat compass is indicated by an arrow (ie, north is to the right in the diagram) through the wire as

Explanation / Answer

13.a ans

Ampère's right hand screw rule state-

An electric current passes through a straight wire. Grabbing the wire points the thumb in the direction of the conventional current (from positive to negative), while the fingers point in the direction of the magnetic flux lines. The direction of the magnetic field (counterclockwise instead of clockwise when viewed from the tip of the thumb) is a result of this convention and not an underlying physical phenomenon. The thumb points direction of current and fingers point direction of magnetic lines of force.

so as in part a magnetic field is in clockwise direction(top view) for magnet becuse magnetic line come from north and enter in south.

so for wire it is counter clockwise(top view ) so fit the Ampere's law

direction of current is in upward direction means towars B terminal

part b

as we know current flow through high voltage to low voltage terminal so terminal A is positive and terminal B is negative

partc

if we cosider magnet is large in size so magnetic field line goes inward of paper

now by right hand palm rule

finger show the direction of magnetic filed and thumb show the direction of current than force exert in the direction of palm .

so force act right ward of current wire

14 ans

grab the wire thumb direction is into page so just curl your finger toward right it show the direction of magnetic field so direction of magnetic field is in the C

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