A voltmeter should have large resistance.
Explanation:
Þ An ammeter should have small resistane. To measure the accurate reading of current in the circuit by Ammeter.
þ A voltmeter should have large resistance. To measure the accurate reading of voltage across voltmeter.
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Due to the flow of current in a circular loop of radius R, the magnetic induction produced at the centre of the loop is B. The magnetic moment of the loop is (
|
(a) |
(b) |
(c) |
(d) |
When two identical capacitors are in series have 3mF capacitance and when parallel 12mF. What is the capacitance of each
|
(a) 6 μF |
(b) 3 μF |
(c) 12 μF |
(d) 9 μF |
A 4 mF capacitor, a resistance of 2.5 MW is in series with 12 V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor. [Given ln(2)= 0.693]
|
(a) 13.86 s |
(b) 6.93 s |
(c) 7 s |
(d) 14 s |
A radioactive nucleus undergoes a series of decay according to the scheme A 
If the mass number and atomic number of A are 180 and 72 respectively, then what are these number for A4
|
(a) 172 and 69 |
(b) 174 and 70 |
(c) 176 and 69 |
(d) 176 and 70 |
As in figure shown, if a capacitor C is charged by connecting it with resistance R, then energy is given by the battery will be
|
(a) |
(b) More than |
(c) Less than |
(d) Zero |
