Embibe Experts Solutions for Chapter: Magnetic Effect of Current, Exercise 4: Exercise (Analytical Questions)

A long solenoid carrying a current produces a magnetic field $B$ along its axis. If the current is doubled and the number of turns per $\mathrm{cm}$ is halved, the new value of magnetic field will be equal to

If an electron of velocity $(2\hat{\mathrm{i}}+3\hat{\mathrm{j}})$ is subjected to magnetic field of $4\hat{\mathrm{k}},$ then its:-
(a) path will change
(b) speed does not change
(c) path must be circular
(d) momentum is constant

If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then

When a charged particle enters in a uniform magnetic field, its kinetic energy

Two particles x and y have equal charges and possessing equal kinetic energy enter in a uniform magnetic field and describe circular path of radius of curvature r₁ and r₂ respectively. The ratio of their masses is :- 

Flux passing through loop is proportional to 

Two long wires hating current as shown placed at separation $2 \mathrm{m}$. The magnetic field at mid-point is:-
    

A square loop of resistance 11 $\Omega$ having area 0.15 m² is placed in magnetic field of 2T. Find frequency by which it should be rotated so that average power dissipated in it is 100 W.