- AElectric charge.
- BElectric field.
- CBoth a and b.
- DNone.
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A metallic ring is attached with the wall of a room. When the north pole of a magnet is brought near to it, the induced current in the ring will be

|
(a) First clockwise then anticlockwise |
(b) In clockwise direction |
|
(c) In anticlockwise direction |
(d) First anticlockwise then clockwise |
The number of turns and radius of cross-section of the coil of a tangent galvanometer are doubled. The reduction factor K will be
| (a) K |
(b) 2K |
(c) 4K |
(d) K/4 |
A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true
|
(a) Potential difference across the terminals of the battery is maximum when R = r |
|
(b) Power delivered to the resistor is maximum when R = r |
|
(c) Current in the circuit is maximum when R = r |
|
(d) Current in the circuit is maximum when R >> r |
A proton and an electron both moving with the same velocity v enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that
|
(a) Their time periods will be same |
|
(b) The time period for proton will be higher |
|
(c) The time period for electron will be higher |
|
(d) Their orbital radii will be same |
A coil of inductance 40 henry is connected in 0series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is
|
(a) 40 seconds |
(b) 20 seconds |
(c) 8 seconds |
(d) 5 seconds |