Magnetic Effects of Current and Magnetism (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 151 - 154 of 155

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Question number: 151

» Magnetic Effects of Current and Magnetism » Ampere's Law

Appeared in Year: 2016

MCQ▾

Question

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is Equation . It is then bent into a circular coil of Equation turns. The magnetic field at the centre of this coil of Equation turns will be –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 152

» Magnetic Effects of Current and Magnetism » Bar Magnet

Appeared in Year: 2016

MCQ▾

Question

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by Equation is Equation . Now the torque required to keep the magnet in this new position is:

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 153

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

Appeared in Year: 2017

MCQ▾

Question

A Equation Turn rectangular coil of length Equation and width Equation carries a current of Equation are subjected to a magnetic field of strength Equation Work done for rotating the coil by Equation against the torque is –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 154

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

Appeared in Year: 2017

MCQ▾

Question

A long solenoid of diameter Equation has Equation turn per meter. At the centre of the solenoid, a coil of Equation turns and radius Equation is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to Equation from Equation in Equation . If the resistance of the coil is Equation the total charge flowing through the coil during this time is –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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