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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Which of the following is wrong statement
|
(a) An emf can be induced between the ends of a straight conductor by moving it through a uniform magnetic field |
|
(b) The self induced emf produced by changing current in a coil always tends to decrease the current |
|
(c) Inserting an iron core in a coil increases its coefficient of self induction |
|
(d) According to Lenz's law, the direction of the induced current is such that it opposes the flux change that causes it |
There is a current of 1.344 amp in a copper wire whose area of cross-section normal to the length of the wire is 1
. If the number of free electrons per 
is 8.4 
, then the drift velocity would be
|
(a) 1.0 mm/sec |
(b) 1.0 m/sec |
(c) 0.1 mm/sec |
(d) 0.01 mm/sec |
A battery of internal resistance 4W is connected to the network of resistances as shown. In order to give the maximum power to the network, the value of R (in Ω) should be
|
(a) 4/9 |
(b) 8/9 |
(c) 2 |
(d) 18 |
A piece of semiconductor is connected in series in an electric circuit. On increasing the temperature, the current in the circuit will
| (a) Decrease | (b) Remain unchanged | (c) Increase | (d) Stop flowing |