Electromagnetic Induction questions
610 published questions with worked solutions.
- A coil having effective area A, is held with its plane normal to magnetic field of induction B. The magnetic induction is quickly...
- The self induction (L) produced by solenoid of length ' ' having 'N' number of turns & cross sectional are 'A' is given by the...
- A horizontal wire of mass 'm' length ' ' and resistance 'R' is sliding on the vertical rails on which uniform magnetic field 'B'...
- A magnetic field of 2 10^ -2 T acts at rights angles to a coil of area 100 cm^2 with 50 turns. The average e.m.f. induced in the...
- Two concentric circular coils having radii r_1 and r_2 (r_2 r_1) are placed co-axially with centres coinciding. The mutual...
- The coefficient of mutual induction is 3H and induced e.m.f. across secondary is 4 kV. Current in primary is reduced from 7A to...
- A coil of 'n' turns and resistance R is connected in series with a resistance R/4. The combination is moved for time 't' second...
- When the number of turns in a coil is made 3 times without any change in the length of coil, its self inductance becomes
- Alternating current of peak value ( 2 ) A flows through the primary coil of a transformer. The coefficient of mutual inductance...
- A circular coil of resistance 'R', area 'A', number of turns 'N' is rotated about its vertical diameter with angular speed ' ' in...
- A coil is wound on a core of rectangular cross-section. If all the linear dimensions of the core are increased by a factor 2 and...
- The mutual inductance of two coils is 45 mH. The self-inductance of the coils are L_1 = 75 , mH and L_2 = 48 , mH . The...
- A coil of resistance 250 is placed in a magnetic field. If the magnetic flux ( ) linked with the coil varies with time (s) as =...
- A straight line conductor of length 0.4 m is moved with a speed of 7.0 ms^ -1 perpendicular to magnetic field of intensity 0.8 Wb...
- Two coils having self-inductance L_1 = 75 mH and L_2 = 48 mH are coupled with each other. If the mutual inductance of the coils...
- If current of 4 A produces magnetic flux of 3 x 10<sup>-3</sup> Wb through a coil of 400 turns, the energy stored in the coil...
- Two coils A and B have 180 and 360 turns respectively. The current of 1A flows through both the coils. Due to current of 1A in...
- The magnetic potential energy stored in a certain inductor is 49 mJ when the current in the inductor is 70 mA. The inductance of...
- Two coils have a mutual inductance of 0.005 H. The current changes in the first coil according to equation I = I_0 t, where I_0 =...
- The magnetic flux through a coil is 4 10^ -4 Wb at time t=0. It reduces to 30% of its original value in time t second. If e.m.f....
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