Tiêu đề 04. MOVING CHARGES AND MAGNETISM(H).pdf ✅

NEET REVISION rent. Then the magnetic field at the centre [Q362569] (1) (2) (3) (4) 18. A galvanometer coil has a resistance of and the ammeter shows full scale deflection for a current of The shunt resistance required to convert the galvanometer into an ammeter of range is about [Q362943] (1) (2) (3) (4) 19. A current loop, having two circular arc is joined by two radial lines (as shown in fig.) and carries a current of . The magnetic field at point is . Then find [Q362549] (1) 1.12 (2) 3.67 (3) 7.14 (4) 5.23 20. Two long straight wires are connected by a cir‐ cular section which has a radius . All the three segments lie in the same plane and carry a cur‐ rent . The magnetic induction at the centre of the circular segments is. [Q362600] (1) (2) (3) (4) 21. In the hydrogen atom, the electron is making . If the radius of the orbit is , then magnetic field produced at the centre of the orbit is [Q362627] (1) (2) (3) (4) 22. The rectangular coil having 100 turns is present in a uniform magnetic field of as shown in the figure. The torque acting on the loop is [Q363042] (1) (2) (3) (4) Zero 23. A cylindrical conductor of radius carries a current . The value of magnetic field at a point which is distance inside from the surface is . The value of magnetic field at point which is distance outside from the surface is [Q362497] (1) (2) (3) (4) 24. The position of point from wire where net magnetic field is zero, due to following current distribution, will be [Q362655] (1) at a point lying outside the wires (2) at a point lying between the wires (3) at a point lying between the wires (4) at a point lying outside the wires 25. A proton (mass ) ) accelerated by a potential difference flies through a uniform transverse magnetic field . The field occupies a region of space by width if ' ' be the angle of devia‐ tion of proton from initial direction of motion (see figure), the value of will be : [Q362833] (1) (2) (3) (4) 26. The dipole moment of a circular loop carrying a current , is and the magnetic field at the cen‐ tre of the loop is . Where the dipole moment is doubled by keeping the current constant, the magnetic field at the centre of the loop is . The ratio is: [Q363013] (1) (2) B2 = B1 9 9B1 3B1 B1 3 10Ω 1 mA. 0 − 100 mA 10Ω 1Ω 0.1Ω 0.01Ω 10A 0 N × 10 −5 T N. R I O μ0I 4πR αμ0I 4πR αμ0I 2πR αμ0I R 6.6 × 10 15rps 0.53 × 10 −10 m 140 T 12.5 T 1.4 T 0.14 T ^j 0.05 √2 22.64 × 10 −4 (Nm)kˆ 11.32 × 10 −5 (Nm)kˆ 5.66 × 10 −5(Nm)kˆ R i R 4 10 T 4R T 4 3 T 8 3 T 40 3 T 80 3 P B 5 cm 3 cm 1 cm 2 cm m V B ′d ′ α sin α B √d q 2mV q V √ Bd 2 m Bd√ q 2mV B √2 qd mV I m B1 B2 B1 B2 √3 √2