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An electric potential difference will be induced between the ends of the conductor shown in the diagram, when the conductor moves in the direction 

(1) P

(2) Q

(3) L

(4) M

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Two rails of a railway track insulated from each other and the ground are connected to a milli voltmeter. What is the reading of voltmeter, when a train travels with a speed of 180 km/hr along the track. Given that the vertical component of earth's magnetic field is 0.2 × 10–4 weber/m2 and the rails are separated by 1 metre 

(1) 10–2 volt

(2) 10–4 volt

(3) 10–3 volt

(4) 1 volt

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A conducting wire is moving towards right in a magnetic field B. The direction of induced current in the wire is shown in the figure. The direction of magnetic field will be 

(1) In the plane of paper pointing towards right

(2) In the plane of paper pointing towards left

(3) Perpendicular to the plane of paper and down wards

(4) Perpendicular to the plane of paper and upwards

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One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v then the emf induced in the circuit in terms of B, l and v where l is the width of each tube, will be 

(1) Zero

(2) 2 Blv

(3) Blv

(4) – Blv

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