Two particles A and B having charges 20$$\mu$$C and $$-$$5$$\mu$$C respectively are held fixed with a separation of 5 cm. At what position a third charged particle should be placed so that it does not experience a net electric force?
A
At 5 cm from 20 $$\mu$$C on the left side of system
B
At 5 cm from $$-$$5 $$\mu$$C on the right side
C
At 1.25 cm from $$-$$5 $$\mu$$C between two charges
D
At midpoint between two charges
Explanation
Null point is possible only right side of $$-$$5 $$\mu$$C
For full scale deflection of total 50 divisions, 50 mV voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is 2 div/mA will be :
The Colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is :
A
(5700 $$\pm$$ 285) $$\Omega$$
B
(7500 $$\pm$$ 750) $$\Omega$$
C
(5700 $$\pm$$ 375) $$\Omega$$
D
(7500 $$\pm$$ 375) $$\Omega$$
Explanation
R = 75 $$\times$$ 102 $$\pm$$ 5% of 7500
R = (7500 $$\pm$$ 375) $$\Omega$$
4
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MCQ (Single Correct Answer)
If you are provided a set of resistances 2$$\Omega$$, 4$$\Omega$$, 6$$\Omega$$ and 8$$\Omega$$. Connect these resistances so as to obtain an equivalent resistance of $${{46} \over 3}$$$$\Omega$$.
A
4$$\Omega$$ and 6$$\Omega$$ are in parallel with 2$$\Omega$$ and 8$$\Omega$$ in series
B
6$$\Omega$$ and 8$$\Omega$$ are in parallel with 2$$\Omega$$ and 4$$\Omega$$ in series
C
2$$\Omega$$ and 6$$\Omega$$ are in parallel with 4$$\Omega$$ and 8$$\Omega$$ in series
D
2$$\Omega$$ and 4$$\Omega$$ are in parallel with 6$$\Omega$$ and 8$$\Omega$$ in series
Explanation
Questions Asked from Electrostatics
On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions
