- Acontinuous when electric field is changing in the circuit
- Bcontinuous when magnetic field is changing in the circuit
- Ccontinuous in both types of fields
- Dcontinuous through wires and resistance only
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Four wires each of length 2.0 metres are bent into four loops P, Q, R and S and then suspended into uniform magnetic field. Same current is passed in each loop. Which statement is correct
|
(a) Couple on loop P will be the highest |
(b) Couple on loop Q will be the highest |
|
(c) Couple on loop R will be the highest |
(d) Couple on loop S will be the highest |
A wire of length 1 m is moving at a speed of 2ms–1 perpendicular to its length and a homogeneous magnetic field of 0.5 T. The ends of the wire are joined to a circuit of resistance 6 W. The rate at which work is being done to keep the wire moving at constant speed is
|
(a) |
(b) |
(c) |
(d) 1W |
To make a PN junction conducting
|
(a) The value of forward bias should be more than the barrier potential |
|
(b) The value of forward bias should be less than the barrier potential |
|
(c) The value of reverse bias should be more than the barrier potential |
|
(d) The value of reverse bias should be less than the barrier potential |
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
and the rails are separated by 1 metre
|
(a) |
(b) |
(c) |
(d) 1 volt |
A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm
|
(a) + 3.0 D |
(b) + 0.125 D |
(c) – 3.0 D |
(d) + 4.0 D |