One tesla or tesla can be defined as the magnetic field through which a particle carrying a charge of 1 coulomb must move perpendicularly at a speed of 1 meter per second to experience a force having the magnitude of 1 Newton as per the Lorentz force law. The SI base units of the tesla are kilogram second -2 ampere -1 or K g s - 2 A - 1 .

The Weber is the SI derived unit of magnetic flux. The Weber is named after the German physicist Wilhelm Eduard Weber. A magnetic flux of one Weber , passing through a conducting loop and reduced to zero at a uniform rate in one second, In other words, Weber , unit of magnetic flux in the International System of Units (SI), defined as the amount of flux that, linking an electrical circuit of one turn (one loop of wire), produces in it an electromotive force of one volt as the flux is reduced to zero at a uniform rate in one second.

How is a galvanometer converted to an ammeter?

As we know that, a galvanometer is a device that is used to detect small electric current flowing in the circuit and an ammeter is an instrument used to measure the current in a circuit. And ammeter is connected in series with the circuit. It is a low resistance instrument. A Galvanometer is converted into an ammeter by connecting a low resistance S of suitable value in parallel with the galvanometer coil. Here, S = G I g I - I g where, G = Resistance of the Galvanometer

E M B I B E

Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 24

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A proton and an alpha particle enter a uniform magnetic field with the same velocity. The period of rotation of the $α -$ particle will be

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Important Questions on Magnetic Effect of Electric Current

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Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 25

Two thin long parallel wires separated by a distance

b

are carrying a current

i

amp each. The magnitude of the force per unit length exerted by one wire on the other is

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Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 26

A conducting circular loop of radius

r

carries a constant current i. It is placed in a uniform magnetic field

B

such that

B

is perpendicular to the plane of the loop. The magnetic force acting on the loop is

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Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 27

The time rate of work done by a magnetic field on a charged particle moving on a helical path is

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Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 1

Define a tesla?

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IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 2

Define a weber.

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Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 3

Draw the magnetic lines of induction due to a conductor carrying current in the upward direction.

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Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 4

Sketch a curve to show how the magnetic flux density near a straight conductor carrying current, varies with distance away from the current.

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Bureau's Higher Secondary Physics Class 12>Chapter 8 - Magnetic Effect of Electric Current>MODEL QUESTIONS>Q 5

The number of turns and the radius of a flat circular coil carrying current are both doubled. What happens to the original magnetic field produced at its centre?