- A$r_n \propto n^{1 / 2}$
- ✓$r_n \propto n^2$
- C$r_n \propto n^2$
- D$r_n \propto n$
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A current loop placed in a magnetic field behaves like a
|
(a) Magnetic dipole |
(b) Magnetic substance |
(c) Magnetic pole |
(d) All are true |
What will happen when a 40 watt, 220 volt lamp and 100 watt, 220 volt lamp are connected in series across 40 volt supply
|
(a) 100 watt lamp will fuse |
(b) 40 watt lamp will fuse |
|
(c) Both lamps will fuse |
(d) Neither lamp will fuse |
$\vec{\text{r}}.\vec{\text{F}}=0$ and $\vec{\text{F}}.\vec{\tau}=0$
$\vec{\text{r}}.\vec{\tau}=0$ but $\vec{\text{F}}.\vec{\tau}\neq0$
$\vec{\text{r}}.\vec{\tau}\neq0$ but $\vec{\text{F}}.\vec{\tau}=0$
$\vec{\text{r}}.\vec{\tau}\neq0$ and $\vec{\text{F}}.\vec{\tau}\neq0$
What should be the current in a circular coil of radius 5cm to annul
|
(a) 0.4 A |
(b) 4 A |
(c) 40 A |
(d) 1 A |
A simple microscope has:
A hydrogen atom (ionisation potential 13.6 eV) makes a transition from third excited state to first excited state. The energy of the photon emitted in the process is
|
(a) 1.89 eV |
(b) 2.55 eV |
(c) 12.09 eV |
(d) 12.75 eV |