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A conducting wheel rim in which there are three conducting rods of each of length l is rotating with constant angular velocity ω in a uniform magnetic field B as shown in figure. The induced potential difference between its centre and rim will be

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Important Questions on Electromagnetic Induction

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Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 62
A metal cube of side 2 cm is travelling with a velocity v=6 m/s j^ in a magnetic field of B→=0.1  k^T, then find potential difference between two faces perpendicular to x- axis.
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Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 63

A conducting rod AB of length l=1 m, is moving at a velocity v=4 m s-1, making an angle 30∘ with its length. A uniform magnetic field B = 2T exists in a direction perpendicular to the plane of motion. Then,

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Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 64
The wing span of an aeroplane is 36 m. If the plane is flaying at 400 km h-1, the emf induced between the wings tips is (assume B=4×10-5 T)
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Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 65
A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A magnetic induction B constant in time and space, pointing perpendicular and into the plane of the loop exists everywhere with part of the loop outside the field, as shown in figure. The induced emf is


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Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 66
The current from A to B is increasing in magnitude. What is the direction of induced current, if any, in the loop shown in figure.

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Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 67
A loop of area 0.1 m2 rotates with a speed of 60 rps perpendicular to a magnetic field of 0.4 T. If there are 100 turns in the loop, maximum voltage induced in the loop is
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Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 68
The two rails of a railway track insulated from each other and the ground are connected to a milli-voltmeter. What is the reading of the mV, when a train travels at a speed of 180 km h-1 along the track, given that the horizontal components of earth's magnetic field is 0.2×10-4 Wb m-2 and the rails are separated by 1 m.
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Achieve CUET (UG) Physics Practice Book>Chapter 6 - Electromagnetic Induction>Exercise>Q 69
A metallic circular loop of radius r is placed in a uniform magnetic field B, acting perpendicular to the plane of the loop. A naughty boy pulls the diametrically opposite corner so that, after sometime, the loop changes into an ellipse of major and minor radius a and b. If total resistance of loop is R and it remains constant during the pulling, find the average charge flowing through loop during the pulling.