4. Moving Charges and Magnetism
рдЗрд╕ рдкреЗрдЬ рдкрд░ рдЖрдкрдХреЛ 4. Moving Charges and Magnetism рдХреЗ рд╕рднреА рдорд╣рддреНрд╡рдкреВрд░реНрдг рдмрд╣реБрд╡рд┐рдХрд▓реНрдкреАрдп рдкреНрд░рд╢реНрди (MCQ), рдкрд░реАрдХреНрд╖рд╛ рдЙрдкрдпреЛрдЧреА рдиреЛрдЯреНрд╕ рдФрд░ рдСрдирд▓рд╛рдЗрди рдХреНрд╡рд┐рдЬрд╝ рдорд┐рд▓реЗрдВрдЧреЗред рдЕрдкрдиреЗ рдЬреНрдЮрд╛рди рдХрд╛ рдкрд░реАрдХреНрд╖рдг рдХрд░рдиреЗ рдФрд░ рдмреЛрд░реНрдб/рдкреНрд░рддрд┐рдпреЛрдЧреА рдкрд░реАрдХреНрд╖рд╛ рдореЗрдВ рд╢рдд-рдкреНрд░рддрд┐рд╢рдд рдЕрдВрдХ рдкреНрд░рд╛рдкреНрдд рдХрд░рдиреЗ рдХреЗ рд▓рд┐рдП рдиреАрдЪреЗ рджрд┐рдП рдЧрдП рдореЙрдХ рдЯреЗрд╕реНрдЯ рдореЗрдВ рдЕрд╡рд╢реНрдп рднрд╛рдЧ рд▓реЗрдВред
ЁЯСЙ рдЕрдзреНрдпрд╛рдп рдХрд╛ рд╕рд╛рд░рд╛рдВрд╢ (Summary)
Dear students, in this chapter, we will study 1 extremely magical and highly fundamental branch of physics that strongly connects 2 completely different phenomena: electricity and magnetism. Our Chapter 4 is 'Moving Charges and Magnetism'. In the previous chapter, we deeply studied current electricity, where we learned about the continuous flow of electric charges in 1 straight wire. But what exactly happens in the surrounding space when these microscopic charges move continuously? In 1820, a brilliant scientist named Hans Christian Oersted accidentally discovered 1 highly revolutionary fact. He practically noticed that 1 magnetic compass needle strongly deflected when placed near 1 current-carrying wire. This single observation 100 percent proved that moving electric charges naturally produce 1 magnetic field around them.
Instead of just cramming complex mathematical derivations in closed books, if we logically connect physics with our real life and daily surroundings, it feels extremely fascinating. Have you ever thought deeply about how the giant electric motor inside 1 heavy washing machine or the small motor inside your electric fan actually spins? Or how massive bullet trains, known as Maglev trains, float wonderfully above the tracks without touching them? This is no magic trick, but it is 100 percent the scientific marvel of the magnetic effect of electric current and magnetic force. When 1 current-carrying coil is placed inside 1 external magnetic field, it experiences 1 strong mechanical torque, forcing it to rotate continuously. This exact principle actively runs billions of electric motors worldwide today.
From the strict perspective of the upcoming NCERT and RBSE board exams, this specific chapter of physics is highly scoring and extremely important for your 100 percent success. In the board exams, not only direct theoretical questions are asked from this chapter, but excellent analytical, numerical, and derivation-based questions on the Biot-Savart Law, Ampere's Circuital Law, and the moving coil galvanometer definitely appear in the final exam paper every single year without fail. In this highly exciting journey, we will 1st study the exact mathematical formula of the Biot-Savart Law very closely. We will scientifically learn how to accurately calculate the magnetic field produced by 1 small current element at any given point in space.
Moving 1 little further in the chapter, we will logically analyze the extremely powerful Ampere's Circuital Law, which provides 1 highly simplified and brilliant mathematical tool to easily calculate the magnetic field produced by complex symmetrical current distributions, exactly like 1 infinitely long straight wire or 1 tightly wound solenoid. A solenoid is basically 1 long coil containing many circular turns of insulated copper wire, which acts exactly like 1 strong bar magnet when current passes through it. After this, we will deeply study the exact magnetic force experienced by 1 moving charge inside 1 uniform magnetic field, mathematically given by the Lorentz force equation. Understanding the complete working principle of the Cyclotron, a massive machine used to strongly accelerate charged particles like protons to extremely high energies, is also 1 highly crucial topic.
Finally, we will deeply understand the sensitive construction and working of 1 Moving Coil Galvanometer. We will logically see how this highly delicate instrument can be practically converted into 1 precise ammeter by actively connecting 1 small shunt resistance in parallel, or into 1 voltmeter by connecting 1 high resistance in series. To perfectly ensure your excellent and 100 percent strong preparation, we have meticulously selected and prepared completely accurate, high-level, and highly exam-useful objective questions (MCQs) from all these complex topics. By continuously practicing again and again, you will surely learn critical time management and massively increase your speed of solving complex numerical questions without making even 1 single mistake.
Feature: This is 1 3-Level based unique quiz. To unlock the next level (Level 2 and 3), students must score at least 70% in the current level, making their board exam preparation 100% strong.
рдорд╣рддреНрд╡рдкреВрд░реНрдг рдкреНрд░рд╢реНрди (Important Questions)
PDF рдбрд╛рдЙрдирд▓реЛрдб рдХрд░реЗрдВрдЕрдзреНрдпрд╛рдп рдХреЗ рд╕рднреА рдкреНрд░рд╢реНрди (Revision Notes)
*рдиреЛрдЯ: рдпрд╣ рд╕реЗрдХреНрд╢рди рд░рд┐рд╡реАрдЬрди рдХреЗ рд▓рд┐рдП рд╣реИред рдЕрдкрдирд╛ рдЬреНрдЮрд╛рди рдкрд░рдЦрдиреЗ рдХреЗ рд▓рд┐рдП рдКрдкрд░ рджрд┐рдП рдЧрдП рдХреНрд╡рд┐рдЬрд╝ рдореЗрдВ рднрд╛рдЧ рд▓реЗрдВред
-
Unit of magnetic field is?
A) Tesla | B) Weber | C) Ampere | D) Volt -
Formula for Lorentz force is?
A) q(vB) | B) q(E + vxB) | C) ma | D) qv -
Magnetic force on a current conductor is?
A) BIL sin╬╕ | B) qvB | C) ma | D) IR -
Biot-Savart law is related to?
A) Electric field | B) Magnetic field | C) Gravitation | D) None -
Ampere's circuital law is?
A) тИоB.dl = ┬╡0I | B) V = IR | C) F = ma | D) Q = ne -
Magnetic force on moving charge is maximum when angle is?
A) 0┬░ | B) 45┬░ | C) 90┬░ | D) 180┬░ -
Moving coil galvanometer measures?
A) Small current | B) High potential | C) Charge | D) Resistance -
Magnetic field inside a solenoid is?
A) Zero | B) Uniform | C) Infinity | D) Minimum -
Force when current flows in same direction in two parallel wires?
A) Attraction | B) Repulsion | C) Zero | D) Uncertain -
To convert galvanometer to ammeter, we connect?
A) High resistance in series | B) Low resistance in parallel | C) Low resistance in series | D) None -
To convert galvanometer to voltmeter, we connect?
A) High resistance in series | B) Low resistance in parallel | C) Zero resistance | D) None -
Unit of magnetic dipole moment (M) is?
A) A-m^2 | B) A/m | C) T-m | D) Wb -
Cyclotron is used to accelerate?
A) Electrons | B) Heavy positive ions | C) Neutrons | D) Molecules -
Angle of dip at Earth's magnetic poles is?
A) 0┬░ | B) 45┬░ | C) 90┬░ | D) 180┬░ -
Unit of magnetic flux is?
A) Weber | B) Tesla | C) Ampere | D) Watt -
Magnetic field (B) at center of circular loop is ......... to radius (R)?
A) Directly proportional | B) Inversely proportional | C) Proportional to square | D) Independent -
Path of charge in field is circular if velocity is?
A) Parallel | B) Perpendicular | C) At 45┬░ | D) Opposite -
Resistance of a Shunt is?
A) Very high | B) Very low | C) Zero | D) Infinity -
Resistance of an ideal voltmeter is?
A) Zero | B) Small | C) Infinity | D) 1000 Ohm -
Net force on a current loop in uniform magnetic field is?
A) MB | B) Zero | C) IAB | D) None -
Magnetic field lines form?
A) Closed loops | B) Open loops | C) Straight lines | D) None -
Field varies with distance 'r' in Biot-Savart law as?
A) 1/r | B) 1/r^2 | C) 1/r^3 | D) r -
Force between parallel wires with opposite currents?
A) Attraction | B) Repulsion | C) Zero | D) Infinity -
Sensitivity of galvanometer can be increased by?
A) Increasing number of turns | B) Increasing area | C) Both A and B | D) Decreasing field -
Magnetic field is a ......... quantity?
A) Scalar | B) Vector | C) Tensor | D) None -
Magnets used in moving coil galvanometer are?
A) Soft iron | B) Concave cylindrical | C) Straight | D) None -
Magnetic field inside a Toroid is?
A) ┬╡0nI | B) Zero | C) Infinity | D) Minimum -
Relation between current density (J) and field (B) is?
A) B = ┬╡0J | B) B тИЭ J | C) None | D) B = J/┬╡0 -
Direction of magnetic moment is?
A) S to N pole | B) N to S pole | C) Upward | D) Downward -
Value of permeability of vacuum (┬╡0) is?
A) 4╧А x 10^-7 | B) 9 x 10^9 | C) 1 | D) Zero -
Force on 1m wire with 1A current in 2T field (perpendicular)?
A) 1 N | B) 2 N | C) 0.5 N | D) Zero -
Field B at center of 10cm turn with 1A current?
A) 2╧А x 10^-6 T | B) 4╧А x 10^-7 T | C) Zero | D) 1 T -
Force per 1m length between two wires 1m apart with 1A current each?
A) 2 x 10^-7 N | B) 4 x 10^-7 N | C) 1 N | D) Zero -
Force on electron moving at 10^6 m/s perpendicular to 0.5T field?
A) 8 x 10^-14 N | B) 1.6 x 10^-19 N | C) Zero | D) 8 N -
B inside 1m solenoid with 100 turns and 1A current?
A) 4╧А x 10^-5 T | B) 4╧А x 10^-7 T | C) Zero | D) 100 T -
Shunt for 100 Ohm galvanometer to measure 1A (Ig=0.01)?
A) 1 Ohm | B) 1.01 Ohm | C) 0.1 Ohm | D) 10 Ohm -
Radius of circular path on doubling velocity of charged particle?
A) Half | B) Double | C) Same | D) Four times -
Radius ratio (rp/r╬▒) for proton and ╬▒-particle entering field with same velocity?
A) 1:1 | B) 1:2 | C) 2:1 | D) 1:4 -
Magnetic moment of current loop (A=0.1m^2, I=10A)?
A) 1 A-m^2 | B) 10 A-m^2 | C) 0.1 A-m^2 | D) Zero -
Force if field B=0.5T and velocity v=10^4 m/s are parallel?
A) 5000 N | B) Zero | C) 10^-15 N | D) Infinity -
Formula for series resistance (R) to increase range of voltmeter?
A) V/Ig - G | B) V/Ig + G | C) Ig/V | D) V.Ig -
Cyclotron frequency (f) does not depend on?
A) Velocity | B) Charge | C) Mass | D) Field -
Superconductors do what to magnetic fields?
A) Attract | B) Repel completely (Meissner effect) | C) Keep constant | D) Destroy -
Torque on current coil in magnetic field is?
A) NIAB sin╬╕ | B) IAB | C) Zero | D) B/I -
Value of minimum possible magnetic moment (Bohr Magneton)?
A) 9.27 x 10^-24 | B) 1.6 x 10^-19 | C) 9.1 x 10^-31 | D) Zero
0
0
0%
рдЕрдкрдирд╛ рд╕реБрдЭрд╛рд╡ рджреЗрдВ (Feedback)
рд╡реЗрдмрд╕рд╛рдЗрдЯ рдХреЛ рдФрд░ рдмреЗрд╣рддрд░ рдмрдирд╛рдиреЗ рдХреЗ рд▓рд┐рдП рдЕрдкрдиреЗ рд╡рд┐рдЪрд╛рд░ рд╣рдореЗрдВ рднреЗрдЬреЗрдВред