MCQ
Consider a vector $\vec{F} \quad 4 \hat{i} 3 \hat{j}$. Another vector that is perpendicular to $\vec{F}$ is
- A$4 \hat{i} \quad 3 \hat{j}$
- B$6 \hat{i}$
- ✓$7 \hat{k}$
- D$3 \hat{i} \quad 4 \hat{j}$
✓
Answer
Correct option: C.
$7 \hat{k}$
(c) Force $F$ lie in the $x-y$ plane so a vector along $z$-axis will be perpendicular to $F$.
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
The condition for a uniform spherical mass $m$ of radius $r$ to be a black hole is [ $\mathrm{G}=$ gravitational constant and $\mathrm{g}=$ acceleration due to gravity]
→Masses of 3 wires of same metal are in the ratio $1: 2: 3$ and their lengths are in the ratio $3: 2: 1$. The electrical resistances are in ratio
→A short bar magnet with its north pole facing north forms a neutral point at $P$ in the horizontal plane. If the magnet is rotated by 90 in the horizontal plane, the net magnetic induction at $P$ is (Horizontal component of earth's magnetic field $=B_H$ )
→The number of photons of wavelength $540 \mathrm{~nm}$ emitted per second by an electric bulb of power $100 \mathrm{~W}$ is (taking $h=6 \times 10^{-34} \mathrm{~J}-\mathrm{sec}$ )
→Two waves $y=0.25 \sin 316 t$ and $y=0.25 \sin 310 t$ are travelling in same direction. The number of beats produced per second will be
→Unpolarized light falls on two polarizing sheets placed one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the final transmitted light is one-third the maximum intensity of the first transmitted beam
An ammeter and a voltmeter of resistance $R$ are connected in series to an electric cell of negligible internal resistance. Their readings are $A$ and $V$ respectively. If another resistance $R$ is connected in parallel with the voltmeter
→A conducting rod $A C$ of length $4 /$ is rotated about a point $O$ in a uniform magnetic field $\vec{B}$ directed into the paper. $A O=I$ and $O C=3l.$ Then
→$\sigma_1$ and $\sigma_2$ are the electrical conductivities of $\mathrm{Ge}$ and $\mathrm{Na}$ respectively. If these substances are heated, then
→A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will