Questions
A long solenoid having 200 turns per cm carries a current of 1.5 amp. At the can be of it is placed a coil of 100 turns of cross-sectional area 3.14 x 10-4 m2 having its axis parallel to the field produced by the solenoid. When the direction of current in the solenoid is reversed within 0.05 sec, the induced e.m.f. in the coil is
detailed solution
Correct option is B
B=μ0ni =4π×10−7200×10−2×1⋅5=3⋅8×10−2W/m2Magnetic flux through each turn of the coilΦ=BA=3⋅8×10−23⋅14×10−4=1⋅2×10−5 weber When the current in the solenoid is reversed, the change in magnetic flux=2×1⋅2×10−5=2⋅4×10−5 weber Induced e.m.f.=NdΦdt=100×2⋅4×10−50⋅05=0⋅048VTalk to our academic expert!
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A coil having n turns and resistance R is connected with a galvanometer of resistance 4 R . This combination is moved in time t seconds from a magnetic field B1 weber to B2 weber. The induced current in the-circuit is
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