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12th Gujarat Board
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Point out the correct direction of the magnetic field in the given figures.

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Important Questions on Moving Charges and Magnetism

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12th Gujarat Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus - 2023)>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 22
A proton and an electron both moving with the same velocity 5310 ms enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that
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12th Gujarat Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus - 2023)>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 23
Under the influence of a uniform magnetic field, a charged particle is moving in a circle of radius R with constant speed v. The time period of the motion
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12th Gujarat Board
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Physics Crash Course (Based on Revised Syllabus - 2023)>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 24
An electron having mass 9.1×10-31 kg and charge 1.6×10-19 C moves in a circular path of radius 0.5 m with a velocity 106 m s-1 in a magnetic field. Strength of magnetic field is
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12th Gujarat Board
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Physics Crash Course (Based on Revised Syllabus - 2023)>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 25
Two long straight wires are set parallel to each other. Each carries a current i in the same direction and separation between them is 2 r. Intensity of magnetic field midway between them is
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12th Gujarat Board
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Physics Crash Course (Based on Revised Syllabus - 2023)>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 26
A moving coil galvanometer has a coil of effective area A and number of turns N. The magnetic field B is radial. If a current I is passed through the coil, the torque acting on the coil is
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12th Gujarat Board
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Physics Crash Course (Based on Revised Syllabus - 2023)>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 30
The magnetic field near a current carrying conductor is given by 
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12th Gujarat Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus - 2023)>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 31
A magnetizing field of 2×103 A m-1 produces a magnetic flux density of 8π T in an iron rod. The relative permeability of the rod will be
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12th Gujarat Board
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Physics Crash Course (Based on Revised Syllabus - 2023)>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 29
 A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60°with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.