MCQ
Gravitational force has only on sign but coulomb force has:
- APositive sign.
- BNegative sign.
- ✓Both $a$ and $b.$
- DNone.
✓
Answer
Correct option: C.
Both $a$ and $b.$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A normal eye is not able to see objects closer than 25cm because:
Two condensers of capacities $1\,\mu F$ and $2\,\mu F$ are connected in series and the system is charged to $120\;volts$. Then the $P.D.$ on $1\,\mu F$ capacitor (in $volts$) will be
→A $6kHz$ sinusoidal voltage is applied to a series $RC$ circuit. The frequency of the voltage across the resistor is.
→The ionization potential for second He electron is......$eV$
→The time taken by sunlight to cross a $5 \,mm$ thick glass plate $(\mu = 3/2$) is
→A coil has $1,000$ turns and $500\, cm^2$ as its area. The plane of the coil is placed at right angles to a magnetic induction field of $2 \times {10^{ - 5}}\,Wb/{m^2}$. The coil is rotated through ${180^o}$ in $0.2$ seconds. The average $e.m.f$. induced in the coil, in milli-volts, is
→Assertion : In the process of photoelectric emission, all the emitted photoelectrons have the same kinetic energy.
Reason : The photon transfers its whole energy to the electron of the atom in photoelectric effect.
Reason : The photon transfers its whole energy to the electron of the atom in photoelectric effect.
A closely wound coil of $100$ turns and area of cross-section $1\;c{m^2}$ has a coefficient of self-induction $1 \,mH$. The magnetic induction in the centre of the core of the coil when a current of $2A$ flows in it, will be......$Wb{m^{ - 2}}$
→The $r.m.s.$ current in an ac circuit is $2 A$. If the wattless current be $\sqrt 3 A$, what is the power factor
→Input waveforms $A$ and $B$ as shown in fig $I$ are applied to the combination of gates as shown in Fig.$II$. Which of the waveforms shown in Fig. $(i)$ to $(iv)$ correctly represents the output waveform?
→