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Answers
Sol 4.1
Number of turns on the circular coil, n = 100
Radius of each turn, r = 8.0 cm = 0.08 m
Current flowing in the coil, I = 0.4 A
Magnitude of the magnetic field at the centre of the coil is given by the relation,
| B | = μ0 2πnI / 4π r
Where,
μ0 = Permeability of free space
= 4π × 10–7 T m A–1
| B | = 4π x 10-7 x 2π x 100 x 0.4 / 4π x 0.08
= 3.14 x 10-4 T
Hence, the magnitude of the magnetic field is 3.14 × 10–4 T.
Sol 4.2
Current in the wire, I = 35 A
Distance of a point from the wire, r = 20 cm = 0.2 m
Magnitude of the magnetic field at this point is given as:
B  attached above
Where,
μ0= Permeability of free space = 4π × 10–7 T m A–1
attached above
Hence, the magnitude of the magnetic field at a point 20 cm from the wire is 3.5 × 10–5 T.
Sol 4.3
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2257-a-long-straight-wire-in-the-horizontal-plane-carri
Sol 4.4
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2258-a-horizontal-overhead-power-line-carries-a-current
Sol 4.5
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2259-what-is-the-magnitude-of-magnetic-force-per-unit-l
Sol 4.6
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2260-a-3-0-cm-wire-carrying-a-current-of-10-a-is-placed
Sol 4.7
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2261-two-long-and-parallel-straight-wires-a-and-b-carry
Sol 4.8
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2262-a-closely-wound-solenoid-80-cm-long-has-5-layers-o
Sol 4.9
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2263-a-square-coil-of-side-10-cm-consists-of-20-turns-a
Sol 4.10
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2265-two-moving-coil-meters-m1-and-m2-have-the-followi
Sol 4.11
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2264-in-a-chamber-a-uniform-magnetic-field-of-6-5-g-1
Sol 4.12
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2294-nbsp-in-exercise-obtain-the-frequency-of-revolut
Sol 4.13
https://www.saralstudy.com/study-eschool-ncertsolution/physics/moving-charges-and-magnetism/2295-a-a-circular-coil-of-30-turns-and-radius-8-0-cm
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