Advertisements
Advertisements
प्रश्न
A conducting rod is moved with a constant velocity v in a magnetic field. A potential difference appears across the two ends _____________ .
पर्याय
if `vec v " || "vec l`
if `vec v " || "vec B`
if `vec l " || "vec B`
None of these
Advertisements
उत्तर
None of these
The potential difference across the two ends is given by
`e=Bvl`
It is non-zero only
(i) if the rod is moving in the direction perpendicular to the magnetic field `(vec v bot vec B)`
(ii) if the velocity of the rod is in the direction perpendicular to the length of the rod `(vec v bot vec l)`
(iii) if the magnetic field is perpendicular to the length of the rod `vec l bot vec B`
Thus, none of the above conditions is satisfied in the alternatives given.
APPEARS IN
संबंधित प्रश्न
The magnetic flux through a loop varies according to the relation Φ = 8t2 + 6t + C, where ‘C’ is constant, 'Φ' is in milliweber and 't' is in second. What is the magnitude of induced e.m.f. in the loop at t = 2 seconds.
The phenomenon of electromagnetic induction is
Name a common device that uses electromagnets.
Write some of the important uses of electromagnets.
State whether the following statement are true or false:
A generator works on the principle of electromagnetic induction.
Name one device which works on the phenomenon of electromagnetic induction.
Welders wear special goggles or face masks with glass windows to protect their eyes from electromagnetic radiations. Name the radiations and write the range of their frequency.
Can a transformer work when it is connected to a D.C. source? Give a reason.
The energy stored in a 50 mH inductor carrying a current of 4 A is ______
A thin semi-circular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure.
The potential difference developed across the ring when its speed v , is
State Lenz’s law.
A 50 cm long solenoid has 400 turns per cm. The diameter of the solenoid is 0.04 m. Find the magnetic flux linked with each turn when it carries a current of 1 A.
Ansari Sir was demonstrating an experiment in his class with the setup as shown in the figure below.
A magnet is attached to a spring. The magnet can go in and out of the stationary coil. He lifted the Magnet and released it to make it oscillate through the coil.
Based on your understanding of the phenomenon, answer the following question.
What is the principle which Ansari Sir is trying to demonstrate?
Ansari Sir was demonstrating an experiment in his class with the setup as shown in the figure below.
A magnet is attached to a spring. The magnet can go in and out of the stationary coil. He lifted the Magnet and released it to make it oscillate through the coil.
Based on your understanding of the phenomenon, answer the following question.
Consider the situation where the Magnet goes in and out of the coil. State two changes which could be made to increase the deflection in the galvanometer.
A 0.4 m wire, stretched horizontally, carries an electric current of 15 A, in a magnetic field whose magnetic field intensity is 0.1 N/Am. What is the magnitude of the wire?
The working of a dynamo is based on the principle of
Which of the following phenomena makes use of electromagnetic induction?
In the given circuit, initially switch S1 is closed and S2 and S3 are open. After charging of capacitor, at t = 0, S1 is open and S2 and S3 are closed. If the relation between inductance capacitance and resistance is L = 4CR2 then the time (in sec) after which current passing through capacitor and inductor will be same is ______ × 10-4 N. (Given R = ℓn(2)mΩ, L = 2mH)
Which type of force is experienced by a moving charge in a magnetic field?
