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

NEET REVISION 04. MOVING CHARGES AND MAGNETISM(H) NEET REVISION Date: March 18, 2025 Dura on: 1:00:00 Total Marks: 180 INSTRUCTIONS INSTRUCTIONS PHYSICS 1. An ammeter reads upto . Its internal resis‐ tance is . To increase the range to , the value of the required shunt is [Q362956] (1) (2) (3) (4) 2. In the given figure, magnetic field at the center of ring is . Now, it is turned through a angle about axis, so that two semicircu‐ lar parts are mutually perpendicular. Find the value of magnetic field (in at centre [Q362532] (1) (2) (3) (4) 3. A galvanometer coil has a resistance of and gives full scale deflection for a current of To convert it to an ammeter of range 0 to [Q362952] (1) resistance is to be connected in parallel to the galvanometer (2) resistance is to be connected in series with the galvanometer (3) resistance is to be connected in parallel (4) resistance in series 4. A particle of mass and charge moving with a velocity describes a circular path of radius when subjected to a uniform transverse magnetic field of induction . The work done by the field when the particle completes one full circle is [Q362887] (1) Zero (2) (3) (4) 5. An electron is moving at in a direction parallel to a current of flowing through an infinite long straight wire separated by a perpen‐ dicular distance of in air. Magnetic force experienced by the electron [Q362658] (1) (2) (3) (4) 6. Magnetic field at point of given current distri‐ bution is [Q362643] (1) (2) (3) (4) 7. A galvanometer of resistance has 25 divi‐ sions. A current of gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of it should be connected with a resistance of [Q362964] (1) as a shunt (2) as a shunt (3) in series (4) in series 8. A uniform magnetic field of acts along positive -direction. A rectangular loop of sides and with current of is in plane. The current is in anti clockwise sense with reference to negative -axis. 1 A 0.81Ω 10 A 0.09 Ω 0.03 Ω 0.3 Ω 0.9 Ω (O) 8√2T 90 ∘ xx ′ T ) 8T 16T 4T 24T 15Ω 4 mA. 6 A, 10 m Ω 10 m Ω 5Ω 2Ω M Q v→ R B BQv(2πR) BQ2πR ( ) (2πR) Mv 2 R 10 6 m/s 5 A 10 cm 1.6 × 10 −19 N 1.6 × 10 −20N 1.6 × 10 −18 N 1.6 × 10 −21N M ⊙ 2μ0 π ⊗ 5μ0 2π ⊗ 2μ0 π ⊗ μ0 2π 50 Ω 4 × 10 −4 A 25 V , 2500Ω 245Ω 2550Ω 2450Ω 2 × 10 −3T Y 20 cm 10 cm 5 A Y − Z X


NEET REVISION (3) (4) 2 27. Magnetic field at the centre of a circular loop of area is . The magnetic moment of the loop will be [Q362552] (1) (2) (3) (4) 28. Figure shows an amperian path . Part is in vertical plane while part is in horizontal plane . Direction of circulation along the path is shown by an arrow near point and at . for this path ac‐ cording to Ampere's law will be: [Q362487] (1) (2) (3) (4) 29. The sensitivity of a Galvanometer of resistance becomes 20 times when we used shunt of . Find . [Q363005] (1) (2) (3) (4) 30. Velocity and acceleration vectors of a charged particle moving in a magnetic field at some in‐ stant are and . Select the wrong alternative [Q362877] (1) Kinetic energy of the particle is constant (2) (3) (4) Magnetic field is along -direction 31. A charge particle is projected in a magnetic field . If magnetic force acting on the particle is , then is [Q362728] (1) 3 (2) 6 (3) 10 (4) 5 32. Two identical wires and , each of length ' ', carry the same current . Wire is bent into a circle of radius and wire is bent to form a square of side ' '. If and are the values of magnetic field at the centers of the circle and square respectively, then the ratio is [Q362535] (1) (2) (3) (4) 33. In the given figure the magnetic induction at the point is [Q362596] (1) (2) (3) (4) 34. A particle carrying a charge equal to 100 times the charge on the electron is rotating per second in a circular path of radius 0.8 metre. The value of the magnetic field produced at the centre will be permeability for vacuum [Q362624] (1) (2) (3) (4) . 35. A charged particle of mass and charge enters along at point in a uniform magnetic field existing in the rectangular region of size , where and . The particle leaves the region ex‐ actly at corner point . What is the speed in of the particle? [Q362829] (1) (2) (3) (4) 36. Three rings, each having equal radius , are placed mutually perpendicular to each other and each having its center at the origin of coordinate system. If a current is flowing through each ring, then the magnitude of the magnetic field at 1 √2 A B BA 2 μ0π BA 3/2 μ0π BA 3/2 μ0π 1/2 2BA 3/2 μ0π 1/2 ABCDA ABC PSTU CDA PQRS B D ∮ B→ ⋅ d →l (−i1 + i2) μ0 (i1 − i2 + i3) μ0 (i1 + i2) μ0 i3μ0 171Ω xΩ x 171Ω 9Ω 10Ω 15Ω v→ = 3^i + 4^j a→ = 2^i + x^j x = 3 x = −1.5 z B→ = (5^i + 12^j) × 10 −3T F→ = (24^i − x^j) × 10 −2N x A B l I A R B a BA BB BA BB π 2 16√2 π 2 16 π 2 8√2 π 2 8 O μ0I 4πr + μ0I 4r μ0I 2πr + μ0I 4r μ0I 4πr − μ0I 4r μ0I 4πr (μ0 = ) 10 −7μ0 10 −17μ0 10 −17 μ0 10 −6μ0 m = 1mg q = 1μC AB A B = 1.2 T a × b a = 4 m b = 3 m C v ( 5 m/s 3 m/s 9 m/s 2 m/s R I