Download App

Magnetic Effect of Current — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMagnetic Effect of Current1 Mark
Question

Assertion :  If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic region.

Reason    : Force is directly proportional to the magnetic field applied.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If assertion is false but reason is true.
✓

Answer

(d) If assertion is false but reason is true.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Magnetic Effect of Current→Magnetic Effect of Current — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

The activity of a radioactive sample is measured as 9750 counts per minute at t = 0 and as 975 counts per minute at t = 5 minutes. The decay constant is approximately

(a) 0.230 per minute

(b) 0.461 per minute

(c) 0.691 per minute

(d) 0.922 per minute
→

A coil of 40 W resistance has 100 turns and radius 6 mm is connected to ammeter of resistance of 160 ohms. Coil is placed perpendicular to the magnetic field. When coil is taken out of the field, 32 m C charge flows through it. The intensity of magnetic field will be

(a) 6.55 T

(b) 5.66 T

(c) 0.655 T

(d) 0.566 T
→

White light may be considered to be a mixture of waves with l ranging between 3900 Å and 7800 Å. An oil film of thickness 10,000 Å is examined normally by reflected light. If m = 1.4, then the film appears bright for

(a) 4308 Å, 5091 Å, 6222 Å

(b) 4000 Å, 5091 Å, 5600 Å

(c) 4667 Å, 6222 Å, 7000 Å

(d) 4000 Å, 4667 Å, 5600 Å, 7000Å
→
If instantaneous magnetic flux in a coil is $BA \cos \omega t$, then magnitude of induced emf in the coil is :
→

Assertion  : Amongst alpha, beta and gamma rays, a-particle has maximum penetrating power.

Reason      : The alpha particle is heavier than beta and gamma rays.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

→

Following figure shows cross-sections through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor B will fit snugly within conductor A, and conductor C will fit snugly within conductor B. Relationship between their end to end resistance is

(a) RA = RB = RC

(b) RA > RB > RC

(c) RA < RB < R

(d) Information is not sufficient
→

If an electric current is passed through a nerve of a man, then man         

(a) Begins to laugh

(b) Begins to weep

(c) Is excited

(d) Becomes insensitive to pain
→

As the switch S is closed in the circuit shown in figure, current passed through it is

(a) 4.5 A

(b) 6.0 A

(c) 3.0 A  

(d) Zero
→

A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 10m from the lamp will be

(a) 1.34 V/m

(b) 2.68 V/m

(c) 5.36 V/m

(d) 9.37 V/m
→
What type of surface is the surface of a conductor?
→