As shown in the figure a magnet is moved with a fast speed towards a coil at rest. Due to this induced emf, induced current and induced charge in the coil is E, I and Q respectively. If the speed of the magnet is doubled, the incorrect statement is-
1. E increases
2. I increases
3. Q remains same
4. Q decreases
As shown in the figure a magnet is moved with a fast speed towards a coil at rest. Due to this induced emf, induced current and induced charge in the coil is E, I and Q respectively. If the speed of the magnet is doubled, the incorrect statement is-
1. E increases
2. I increases
3. Q remains same
4. Q decreases
2. I increases
3. Q remains same
4. Q decreases
Subtopic: Faraday's Law & Lenz Law |
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Which one of the following is not made of soft iron?
1. Electromagnet
2. Core of transformer
3. Core of dynamo
4. Magnet of loudspeaker
Subtopic: Magnetic Materials |
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Two tangent galvanometer having coils of the same radius are connected in series. A current flowing in them produces deflection of 60 ° and 45 ° respectively. The ratio of the number of turns in the coils is
+1)/2
/1
+1)/(
-2)
Subtopic: Moving Coil Galvanometer |
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A bar magnet of magnetic moment 104 J/T is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of 4×10-5 T to a direction of 60 ° from the field will be
Subtopic: Bar Magnet |
60%
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An ideal coil of 10 H is joined in serried with a resistance of 5 Ω and battery of 5 V, 2 s after joining the current flowing (in ampere) in the circuit will be
Subtopic: LR circuit |
58%
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A rocket is fired upward from the earth surface such that it creates an acceleration of 19.6 m/s2. If after 5 s, its engine is switched off, the maximum height of the rocket from earth’s surface would be
1. 245 m
2. 490 m
3. 980 m
4. 735 m
Subtopic: Distance & Displacement |
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A 60 kg weight s dragged on a horizontal surface by a rope through a distance of 2m. If coefficient of friction is μ=0.5, the angle of rope with surface is 60 ° and g =9.8 m/s2, then work done is
1. 294 J
2. 15 J
3. 588 J
4. 197 J
2. 15 J
3. 588 J
4. 197 J
Subtopic: Friction |
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A small uncharged metallic sphere is positioned exactly at a point midway between two equal and opposite point charges. If the sphere is slightly displaced towards the positive charge and released then
1. it will oscillate about its original position
2. it will move further towards the positive charge
3. its electric potential energy will decrease and kinetic energy will increase
4. its total energy remains constant but is non-zero
Subtopic: Electric Potential Energy |
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A capacitor of capacitance 5μF is connected as shown in the figure. The internal resistance of the cell is 0.5 Ω. The amount of charge on the capacitor plate is
1. zero
2. 5μC
3. 10μC
4. 25 μC
2. 5μC
3. 10μC
4. 25 μC
Subtopic: Capacitance |
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The resistance if a circular coil of 50 turns and 10 cm diameter is 5Ω. What must be the potential difference across that ends of the coil so as to nullify the earth’s magnetic field (H=0.314 gauss) at the centre of the coil? How should the coil be placed to achieve this result?
1. 0.5 V with plane of coil normal to the magnetic meridian
2. 0.5 V with plane of coil in the magnetic meridian
3. 0.25 V with plane of coil normal to the magnetic meridian
4. 0.25 V with plane of coil in the magnetic meridian
Subtopic: Earth's Magnetism (OLD NCERT) |
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