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#1 Class 12 Physics Moving Charges and Magnetism 2022 Long 5M CBSE
(A) State the working principle of a moving coil galvanometer. What modification is required to make its scale linear? (B) A galvanometer of resistance 49.5 $\Omega$ has a range of 0.05 A. Find the resistance needed t...
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#2 Class 12 Physics Moving Charges and Magnetism 2023 Long 5M CBSE
A point-sized object having charge 1 C and mass 1 g is projected with velocity $2\hat{i}$ m/s from point $(0, 2\text{ cm}, 0)$ in a magnetic field $\vec{B} = -0.1\hat{k}$ T in the first quadrant. (A) What will be the ...
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#3 Class 12 Physics Moving Charges and Magnetism 2020 Short 2M CBSE
Write an expression for the magnetic force per unit length between two parallel thin current-carrying wires. Hence define one ampere.
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#4 Class 12 Physics Moving Charges and Magnetism 2022 Mcq 1M CBSE
A charged particle is projected along the axis of a current-carrying loop. Which of the following statements is true?
A. The acceleration depends on the velocity of projection
B. The acceleration depends on the magnitude of current in the coil
C. The acceleration depends on the radius of the coil
D. The charged particle will move with constant velocity
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#5 Class 12 Physics Moving Charges and Magnetism 2019 Short 2M CBSE
A long solenoid has 800 turns per metre length. A current of 1.6 A flows through it. Calculate the magnetic field induction at the end of the solenoid on its axis. ($\mu_0 = 4\pi \times 10^{-7}$ T·m/A)
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#6 Class 12 Physics Moving Charges and Magnetism 2018 Mcq 1M CBSE
A current-carrying loop is placed in a uniform magnetic field. The torque acting on it does NOT depend upon
A. area of loop
B. shape of loop
C. number of turns in loop
D. strength of current and magnetic field
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#7 Class 12 Physics Moving Charges and Magnetism 2021 Short 2M CBSE
A charged particle of mass $m$ and charge $q$ travels on a circular path of radius $r$ perpendicular to a magnetic field $B$. Write the expression for the time taken by the particle to complete one revolution.
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#8 Class 12 Physics Moving Charges and Magnetism 2020 Short 2M CBSE
Derive the expression for radius $r$ of the circular path of an electron moving in a perpendicular uniform magnetic field $B$.
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#9 Class 12 Physics Moving Charges and Magnetism 2014 Mcq 1M CBSE
A current-carrying coil is placed in a uniform magnetic field of induction $B$. The current in the coil is $i$, it has $n$ turns, $A$ is the face area and the normal to the surface makes an angle $\theta$ with $B$. Th...
A. $niAB\theta$
B. $niAB\cos\theta$
C. $niAB\sin\theta$
D. $niAB\tan\theta$
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#10 Class 12 Physics Moving Charges and Magnetism 2019 Short 2M CBSE
A proton moving with a velocity $2.5 \times 10^7$ m/s enters a magnetic field of intensity 2.5 T at an angle of 30° with the magnetic field. Find the force on the proton. (Charge of proton $e = 1.6 \times 10^{-19}$ C)
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#11 Class 12 Physics Moving Charges and Magnetism 2022 Mcq 1M CBSE
A current passing through a circular coil of 2 turns produces a magnetic field of 8 T at its centre. The coil is rewound to have 4 turns and the current is doubled. The magnetic field at the centre of the new coil wil...
A. 64 T
B. 32 T
C. 16 T
D. 8 T
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#12 Class 12 Physics Moving Charges and Magnetism 2020 Short 1M CBSE
If a current $i$ ampere flows in a long straight thin-walled hollow tube, what is the magnetic field induction at any point inside the tube?
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#13 Class 12 Physics Moving Charges and Magnetism 2018 Mcq 1M CBSE
A charged particle is released from rest in a region of steady and uniform electric and magnetic fields, which are parallel to each other. The particle will move in a
A. circle
B. helix
C. cycloid
D. straight line
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#14 Class 12 Physics Moving Charges and Magnetism 2019 Mcq 1M CBSE
When a charged particle moves perpendicular to a magnetic field, then
A. speed of the particle is changed
B. speed of the particle remains unchanged
C. direction of the particle remains unchanged
D. acceleration of the particle remains unchanged
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#15 Class 12 Physics Moving Charges and Magnetism 2021 Mcq 1M CBSE
A circular coil of radius $r$ carries a current $I$. The magnetic field at its centre is $B$. At what distance from the centre, on the axis of the coil, will the magnetic field be $B/8$?
A. $\sqrt{2}\, r$
B. $2r$
C. $\sqrt{3}\, r$
D. $3r$
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#16 Class 12 Physics Current Electricity 2023 Short 3M CBSE
From the circuit shown in figure with a 4 V battery: (a) Calculate the equivalent resistance. (b) Find magnitude of current in arms AFCED and AFDED.
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#17 Class 12 Physics Current Electricity 2021 Short 2M CBSE
Find the potential difference $V_A - V_B$ in the circuit shown in figure. (Refer to figure in document for circuit values)
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#18 Class 12 Physics Current Electricity 2022 Short 3M CBSE
In the circuit shown in figure, find the current through branch BD. (Refer to figure in document for circuit values)
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#19 Class 12 Physics Current Electricity 2021 Short 3M CBSE
A ring is made of wire having resistance $R_0 = 12\ \Omega$. Find points A and B at which a conductor should be connected so that resistance $R$ of sub-circuit equals $8/3\ \Omega$.
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#20 Class 12 Physics Current Electricity 2020 Short 2M CBSE
A wire of uniform cross-section, length $L$ and resistance $R$ is bent into a complete circle. Find the resistance between any two diametrically opposite points.
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