Explanation:
$\theta_1=θ_2,$ if their masses are the same because the force of repulsion due to charges is the same.
The force Mg $\sin\theta$ opposes the force of repulsion. Even if Q1 and Q2 are different, the force of repulsion is the same for both as they are mutual.
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The rays of different colors fail to converge at a point after going through a converging lens. This defect is called _________.
A cell is connected between two points of a uniformly thick circular conductor. The magnetic field at the centre of the loop will be (Here 
and 
are the currents flowing in the two parts of the circular conductor of radius ‘a’ and 
has the usual meaning)
|
(a) Zero |
(b) |
(c) |
(d) |
The north and south poles of two identical magnets approach a coil, containing a condenser, with equal speeds from opposite sides. Then
|
(a) Plate 1 will be negative and plate 2 positive |
|
(b) Plate 1 will be positive and plate 2 negative |
|
(c) Both the plates will be positive |
|
(d) Both the plates will be negative |
A galvanometer can be used as a voltmeter by connecting a
|
(a) High resistance in series |
(b) Low resistance in series |
|
(c) High resistance in parallel |
(d) Low resistance in parallel |
Which of the following phenomena suggests the presence of electron energy levels in atoms
|
(a) Radio active decay |
(b) Isotopes |
|
(c) Spectral lines |
(d) a -particles scattering |
