题干

如图所示,圆形线圈共100匝、直径d=0.1m,线圈电阻r=0.1Ω,在匀强磁场中绕过直径的轴OO′顺时针(从上往下看)匀速转动,轴OO′和磁场的方向垂直,磁感应强度的大小B=
1
π
T,角速度ω=300rad/s,外电路电阻R=9Ω,交流电表为理想电压表,请回答下列问题:
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    A teenager has gained a six-figure sum for a vampire (吸血鬼) novel she wrote after being inspired by the Twilight. Abigail Gibbs, 18, who started writing the book aged 14, released chapters of her novel online, where the book eventually received 17 million hits. Harper Collins in Britain has now signed this talented author following her extraordinary Internet success.

    Miss Gibbs, from Brixham, Devon, who is about to start studying English at Oxford University, is the first author to be discovered on Wattpad. Wattpad is an online library which allows subscribers (用户) to upload or read other people's stories. Miss Gibbs also said Stephenie Meyer's famous Twilight books had influenced her novel, The Dark Heroine. “I read the Twilight and did really enjoy it. At first, my parents were a bit opposed to my writing because I was staying up till 3 a.m. on school nights and they were worried that I might fall behind.”

    Miss Gibbs finished her book at the age of 16. She posted each chapter after she had written it on the Internet site, until she got to five chapters before the end when she stopped. “I had signed with an agent and he basically said, ‘Don't post anymore so as to keep the readers' anxiety”. That was tough because I disappeared in the site for a year and there were a lot of fans asking where I was. I have had so many requests from fans to upload the last five chapters; some people even said they were going to write their own endings.” Her fans can buy the e-book for £2.99, or wait for the paperback book priced at £6.99 in shops next month.