Page 1 :
SNHS, SREEKANDESWARAM, , 2 Effect of, , , , Q1] Fill in the blanks, a) The direction of the magnetic field is from North(N) pole to South(S) pole, , b) Flow of current is in the opposite direction to flow of electrons., , c) The direction of magnetic field lines reverses when the current thro’ Ry, reversed. oS, Q2] What are the factors influencing the deflection of the ot, , Ans], * The direction of the current “sy, * The position of the =a, , Q3] Name two rules for finding the, Ans], , , , , , * the Right ib Rule, , * Right i>. Rule, Q4] State oe Rule of James Clark Maxwell., , SS, , , , Ans], , Imagine you are holding a current carrying conductor with the right hand in, such a way, that the thumb points in the direction of the current. The direction in which the, other fingers encircle the conductor gives the direction of the magnetic field., , Edit with WPS Office
Page 2 :
SNHS, SREEKANDESWARAM, , Q5] State Right Hand Screw Rule, Ans], , If a right hand screw is rotated in such a way that its tip advances along the, direction of the current in the conductor, then the direction of rotation of the screw gives, the direction of the magnetic field., , Q6] How will the magnetic lines appear when a coil is viewed in such a way that the, current is in;, a] Clockwise direction, b] Anti-clockwise direction, , Ans], , , , , Magnetic Lines, of Force, , away from us, into the coil thro tral part of the coil., , a) When the current is passing in re magnetic lines appear to move, , ~, , 7 =, , , , Magnetic Lines, , Current Flow, , b) When the current is passing in anticlockwise direction, magnetic lines appear to move, , out towards us, from the coil through the central part of the coil., , @ Edit with WPS Office
Page 3 :
SNHS, SREEKANDESWARAM, , Q7] How does the number of turns of the coiled conductor and the intensity of current, affect the magnetic field., Ans], , The strength of the magnetic field increases when the number of turns of the, coil or current is increased., , Q8] Compare the magnetism of a bar magnet and a solenoid, , , , , , , , Ans], Bar Magnet Solenoid, 1 Magnetism is permanent Magnetism is tel, 2 Strength cannot be changed Strength c nged, , , , 3 Field lines are closed, , , , , , , , 4 Magnetic lines start from North to South ne es start from North to South, , f®, Q9] State Fleming's Left Hand Rule Ne, , Force, , , , , , , , , , , , Fleming's Left Hand Rule, , Hold the forefinger, the middle finger and the thumb of the, left hand in mutually perpendicular directions as shown in, the figure. If the forefinger indicates the direction of the, magnetic field and the middle finger, the direction of the, current, then the thumb will indicate the direction of motion, of the conductor., , , , , , Magnetle field, , Current, , @ Edit with WPS Office
Page 4 :
SNHS, SREEKANDESWARAM, , Q10] State Motor Principle, , Motor principle, , A conductor, which can move freely and which is kept in a, magnetic field, experiences a force when current passes, through it and it moves., , SY, , Q11] Why are split ring commutators used in electric motors?, , Ans], , For changing the direction of current “ the c se half rotation, of the coil, , Q12] Name four devices that work on the os of ge?, , Moving coil loudspeaker Ss, Electric motor oF, Fan ge, , Mixie etc. «, , Q13] What is the Gye in moving coil loud speaker?, , Ans], , Ans], , , , trical to mechanical energy; or, , : Electrical to sound energy, , Q14] Explain the working of moving coil loudspeaker, , Ans], , The electrical pulses from a microphone are strengthened using an amplifier, and sent through the voice coil of a loudspeaker. The voice coil, which is placed in the, magnetic field, moves to and fro rapidly, in accordance with the electrical pulses. These, movements make the diaphragm vibrate, thereby reproducing sound., , @ Edit with WPS Office
Page 5 :
SNHS, SREEKANDESWARAM, , Important Diagrams, , 1] Lines of force formed around a bar magnet and a solenoid carrying current., , , , 2] Electric Motor, , , , Electric Motor, Note the parts of an electric motor shown in the figure., N,S ~ Magnetic poles, XY - Axis of rotation of the motor, ABCD — - Amature, B,,B, — - Graphite brushes, R,,R, — - Splitrings, , &, , , , , , , , , , , , 2, peaker, , 3] ow, , , , , , , Soft iron shield, , Diaphragm,, , Voice coil, Soft iron core, , Connecting, , , , Fig. 2.13, , @ Edit with WPS Office
