MCQ
In which of the following fields cathode rays show minimum deflection?
- AElectric field
- BMagnetic field
- CPlasma field
- ✓Gravitational field
✓
Answer
Correct option: D.
Gravitational field
Gravitational field applies minimum force on cathode rays because gravitational forces are proportional to masses but not charges.
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 point charge of $+\,12 \,\mu C$ is at a distance $6 \,cm$ vertically above the centre of a square of side $12\, cm$ as shown in figure. The magnitude of the electric flux through the square will be ....... $\times 10^{3} \,Nm ^{2} / C$
→In a cyclotron, a charged particle:
The percentage of Sun's total energy which reaches the earth's surface is
Silicon is a semiconductor. If a small amount of As is added to it, then its electrical conductivity
A sodium atom is in one of the states labeled 'Lowest excited levels'. It remains in that state for an average time of $10^{-8}\ sec$, before it makes a transition back to a ground state. What is the uncertainty in energy of that excited state
→Four wires of the same diameter are connected in turn between two points, maintained at a constant potential difference. Their resistivities are; $\rho $ and $L$ (wire $1$ )., $1.2\,\rho $ and $1.2\,L$ (wire $2$ ), $0.9\,\rho $ and $0.9\,L$ (wire $3$ ) and $\rho $ and $1.5\,L$ (wire $4$ ). Rank the wires according to the rates at which energy is dissipated as heat, greatest first
→An engine uses $30A$ of current. The resistance offered is $15$ ohms. Calculate the power consumed by the engine in horse power.
→Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value to zero as their temperature is lowered below a critical temperature $T_c(0)$. An interesting property of superconductors is that their critical temperature becomes smaller than $T_c(0)$ if they are placed in a magnetic field, i.e., the critical temperature $T_c(B)$ is a function of the magnetic field strength $B$. The dependence of $T_c(B)$ on $B$ is shown in the figure. $Image$
→$1.$ In the graphs below, the resistance $\mathrm{R}$ of a superconductor is shown as a function of its temperature $\mathrm{T}$ for two different magnetic fields $\mathrm{B}_1$ (solid line) and $\mathrm{B}_2$ (dashed line). If $\mathrm{B}_2$ is larger than $\mathrm{B}_1$ which of the following graphs shows the correct variation of $\mathrm{R}$ with $\mathrm{T}$ in these fields?
MCQ $Image$
$2.$ A superconductor has $T_C(0)=100 \mathrm{~K}$. When a magnetic field of 7.5 Tesla is applied, its $\mathrm{T}_{\mathrm{c}}$ decreases to $75 \mathrm{~K}$. For this material one can definitely say that when
$(A)$ $\mathrm{B}=5$ Tesla, $\mathrm{T}_{\mathrm{c}}(\mathrm{B})=80 \mathrm{~K}$
$(B)$ $\mathrm{B}=5$ Tesla, $75 \mathrm{~K}<\mathrm{T}_{\mathrm{c}}(\mathrm{B})<100 \mathrm{~K}$
$(C)$ $\mathrm{B}=10 \mathrm{Tesla}, 75 \mathrm{~K}<\mathrm{T}_{\mathrm{c}}<100 \mathrm{~K}$
$(D)$ $\mathrm{B}=10$ Tesla, $\mathrm{T}_{\mathrm{c}}=70 \mathrm{~K}$
Give the answer question $1, 2$
An elastic circular wire of length l carries a current I. It is placed in a uniform magnetic field $\vec B$ (Out of paper) such that its plane is perpendicular to the direction of $\vec B$. The wire will experience
→When $\mathrm{U}^{235}$ is bombarded with one neutron, the fission occurs and the products are three neutrons, $36^{\mathrm{Kr}^{94}}$ and
→